vendor test tools in submodule

Instead of using the main module we should vendor the test tools in a
different directory. That way we do not add extra dependencies to the
main module which can be problemetic for packages or other users.

This is already done in buildah so this makes us more consitent.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

14 files changed, 8301 insertions, 0 deletions

diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/.gitignore b/test/tools/vendor/github.com/russross/blackfriday/v2/.gitignore
new file mode 100644
index 000000000..75623dccc
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/.gitignore
@@ -0,0 +1,8 @@
+*.out
+*.swp
+*.8
+*.6
+_obj
+_test*
+markdown
+tags
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/.travis.yml b/test/tools/vendor/github.com/russross/blackfriday/v2/.travis.yml
new file mode 100644
index 000000000..b0b525a5a
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/.travis.yml
@@ -0,0 +1,17 @@
+sudo: false
+language: go
+go:
+  - "1.10.x"
+  - "1.11.x"
+  - tip
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
+install:
+  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
+script:
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d -s .)
+  - go tool vet .
+  - go test -v ./...
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/LICENSE.txt b/test/tools/vendor/github.com/russross/blackfriday/v2/LICENSE.txt
new file mode 100644
index 000000000..2885af360
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/LICENSE.txt
@@ -0,0 +1,29 @@
+Blackfriday is distributed under the Simplified BSD License:
+
+> Copyright © 2011 Russ Ross
+> All rights reserved.
+>
+> Redistribution and use in source and binary forms, with or without
+> modification, are permitted provided that the following conditions
+> are met:
+>
+> 1.  Redistributions of source code must retain the above copyright
+>     notice, this list of conditions and the following disclaimer.
+>
+> 2.  Redistributions in binary form must reproduce the above
+>     copyright notice, this list of conditions and the following
+>     disclaimer in the documentation and/or other materials provided with
+>     the distribution.
+>
+> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+> "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+> FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+> COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+> INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+> BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+> LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+> CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+> LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+> ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+> POSSIBILITY OF SUCH DAMAGE.
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/README.md b/test/tools/vendor/github.com/russross/blackfriday/v2/README.md
new file mode 100644
index 000000000..d9c08a22f
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/README.md
@@ -0,0 +1,335 @@
+Blackfriday
+[![Build Status][BuildV2SVG]][BuildV2URL]
+[![PkgGoDev][PkgGoDevV2SVG]][PkgGoDevV2URL]
+===========
+
+Blackfriday is a [Markdown][1] processor implemented in [Go][2]. It
+is paranoid about its input (so you can safely feed it user-supplied
+data), it is fast, it supports common extensions (tables, smart
+punctuation substitutions, etc.), and it is safe for all utf-8
+(unicode) input.
+
+HTML output is currently supported, along with Smartypants
+extensions.
+
+It started as a translation from C of [Sundown][3].
+
+
+Installation
+------------
+
+Blackfriday is compatible with modern Go releases in module mode.
+With Go installed:
+
+    go get github.com/russross/blackfriday/v2
+
+will resolve and add the package to the current development module,
+then build and install it. Alternatively, you can achieve the same
+if you import it in a package:
+
+    import "github.com/russross/blackfriday/v2"
+
+and `go get` without parameters.
+
+Legacy GOPATH mode is unsupported.
+
+
+Versions
+--------
+
+Currently maintained and recommended version of Blackfriday is `v2`. It's being
+developed on its own branch: https://github.com/russross/blackfriday/tree/v2 and the
+documentation is available at
+https://pkg.go.dev/github.com/russross/blackfriday/v2.
+
+It is `go get`-able in module mode at `github.com/russross/blackfriday/v2`.
+
+Version 2 offers a number of improvements over v1:
+
+* Cleaned up API
+* A separate call to [`Parse`][4], which produces an abstract syntax tree for
+  the document
+* Latest bug fixes
+* Flexibility to easily add your own rendering extensions
+
+Potential drawbacks:
+
+* Our benchmarks show v2 to be slightly slower than v1. Currently in the
+  ballpark of around 15%.
+* API breakage. If you can't afford modifying your code to adhere to the new API
+  and don't care too much about the new features, v2 is probably not for you.
+* Several bug fixes are trailing behind and still need to be forward-ported to
+  v2. See issue [#348](https://github.com/russross/blackfriday/issues/348) for
+  tracking.
+
+If you are still interested in the legacy `v1`, you can import it from
+`github.com/russross/blackfriday`. Documentation for the legacy v1 can be found
+here: https://pkg.go.dev/github.com/russross/blackfriday.
+
+
+Usage
+-----
+
+For the most sensible markdown processing, it is as simple as getting your input
+into a byte slice and calling:
+
+```go
+output := blackfriday.Run(input)
+```
+
+Your input will be parsed and the output rendered with a set of most popular
+extensions enabled. If you want the most basic feature set, corresponding with
+the bare Markdown specification, use:
+
+```go
+output := blackfriday.Run(input, blackfriday.WithNoExtensions())
+```
+
+### Sanitize untrusted content
+
+Blackfriday itself does nothing to protect against malicious content. If you are
+dealing with user-supplied markdown, we recommend running Blackfriday's output
+through HTML sanitizer such as [Bluemonday][5].
+
+Here's an example of simple usage of Blackfriday together with Bluemonday:
+
+```go
+import (
+    "github.com/microcosm-cc/bluemonday"
+    "github.com/russross/blackfriday/v2"
+)
+
+// ...
+unsafe := blackfriday.Run(input)
+html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
+```
+
+### Custom options
+
+If you want to customize the set of options, use `blackfriday.WithExtensions`,
+`blackfriday.WithRenderer` and `blackfriday.WithRefOverride`.
+
+### `blackfriday-tool`
+
+You can also check out `blackfriday-tool` for a more complete example
+of how to use it. Download and install it using:
+
+    go get github.com/russross/blackfriday-tool
+
+This is a simple command-line tool that allows you to process a
+markdown file using a standalone program.  You can also browse the
+source directly on github if you are just looking for some example
+code:
+
+* <https://github.com/russross/blackfriday-tool>
+
+Note that if you have not already done so, installing
+`blackfriday-tool` will be sufficient to download and install
+blackfriday in addition to the tool itself. The tool binary will be
+installed in `$GOPATH/bin`.  This is a statically-linked binary that
+can be copied to wherever you need it without worrying about
+dependencies and library versions.
+
+### Sanitized anchor names
+
+Blackfriday includes an algorithm for creating sanitized anchor names
+corresponding to a given input text. This algorithm is used to create
+anchors for headings when `AutoHeadingIDs` extension is enabled. The
+algorithm has a specification, so that other packages can create
+compatible anchor names and links to those anchors.
+
+The specification is located at https://pkg.go.dev/github.com/russross/blackfriday/v2#hdr-Sanitized_Anchor_Names.
+
+[`SanitizedAnchorName`](https://pkg.go.dev/github.com/russross/blackfriday/v2#SanitizedAnchorName) exposes this functionality, and can be used to
+create compatible links to the anchor names generated by blackfriday.
+This algorithm is also implemented in a small standalone package at
+[`github.com/shurcooL/sanitized_anchor_name`](https://pkg.go.dev/github.com/shurcooL/sanitized_anchor_name). It can be useful for clients
+that want a small package and don't need full functionality of blackfriday.
+
+
+Features
+--------
+
+All features of Sundown are supported, including:
+
+*   **Compatibility**. The Markdown v1.0.3 test suite passes with
+    the `--tidy` option.  Without `--tidy`, the differences are
+    mostly in whitespace and entity escaping, where blackfriday is
+    more consistent and cleaner.
+
+*   **Common extensions**, including table support, fenced code
+    blocks, autolinks, strikethroughs, non-strict emphasis, etc.
+
+*   **Safety**. Blackfriday is paranoid when parsing, making it safe
+    to feed untrusted user input without fear of bad things
+    happening. The test suite stress tests this and there are no
+    known inputs that make it crash.  If you find one, please let me
+    know and send me the input that does it.
+
+    NOTE: "safety" in this context means *runtime safety only*. In order to
+    protect yourself against JavaScript injection in untrusted content, see
+    [this example](https://github.com/russross/blackfriday#sanitize-untrusted-content).
+
+*   **Fast processing**. It is fast enough to render on-demand in
+    most web applications without having to cache the output.
+
+*   **Thread safety**. You can run multiple parsers in different
+    goroutines without ill effect. There is no dependence on global
+    shared state.
+
+*   **Minimal dependencies**. Blackfriday only depends on standard
+    library packages in Go. The source code is pretty
+    self-contained, so it is easy to add to any project, including
+    Google App Engine projects.
+
+*   **Standards compliant**. Output successfully validates using the
+    W3C validation tool for HTML 4.01 and XHTML 1.0 Transitional.
+
+
+Extensions
+----------
+
+In addition to the standard markdown syntax, this package
+implements the following extensions:
+
+*   **Intra-word emphasis supression**. The `_` character is
+    commonly used inside words when discussing code, so having
+    markdown interpret it as an emphasis command is usually the
+    wrong thing. Blackfriday lets you treat all emphasis markers as
+    normal characters when they occur inside a word.
+
+*   **Tables**. Tables can be created by drawing them in the input
+    using a simple syntax:
+
+    ```
+    Name    | Age
+    --------|------
+    Bob     | 27
+    Alice   | 23
+    ```
+
+*   **Fenced code blocks**. In addition to the normal 4-space
+    indentation to mark code blocks, you can explicitly mark them
+    and supply a language (to make syntax highlighting simple). Just
+    mark it like this:
+
+        ```go
+        func getTrue() bool {
+            return true
+        }
+        ```
+
+    You can use 3 or more backticks to mark the beginning of the
+    block, and the same number to mark the end of the block.
+
+    To preserve classes of fenced code blocks while using the bluemonday
+    HTML sanitizer, use the following policy:
+
+    ```go
+    p := bluemonday.UGCPolicy()
+    p.AllowAttrs("class").Matching(regexp.MustCompile("^language-[a-zA-Z0-9]+$")).OnElements("code")
+    html := p.SanitizeBytes(unsafe)
+    ```
+
+*   **Definition lists**. A simple definition list is made of a single-line
+    term followed by a colon and the definition for that term.
+
+        Cat
+        : Fluffy animal everyone likes
+
+        Internet
+        : Vector of transmission for pictures of cats
+
+    Terms must be separated from the previous definition by a blank line.
+
+*   **Footnotes**. A marker in the text that will become a superscript number;
+    a footnote definition that will be placed in a list of footnotes at the
+    end of the document. A footnote looks like this:
+
+        This is a footnote.[^1]
+
+        [^1]: the footnote text.
+
+*   **Autolinking**. Blackfriday can find URLs that have not been
+    explicitly marked as links and turn them into links.
+
+*   **Strikethrough**. Use two tildes (`~~`) to mark text that
+    should be crossed out.
+
+*   **Hard line breaks**. With this extension enabled newlines in the input
+    translate into line breaks in the output. This extension is off by default.
+
+*   **Smart quotes**. Smartypants-style punctuation substitution is
+    supported, turning normal double- and single-quote marks into
+    curly quotes, etc.
+
+*   **LaTeX-style dash parsing** is an additional option, where `--`
+    is translated into `&ndash;`, and `---` is translated into
+    `&mdash;`. This differs from most smartypants processors, which
+    turn a single hyphen into an ndash and a double hyphen into an
+    mdash.
+
+*   **Smart fractions**, where anything that looks like a fraction
+    is translated into suitable HTML (instead of just a few special
+    cases like most smartypant processors). For example, `4/5`
+    becomes `<sup>4</sup>&frasl;<sub>5</sub>`, which renders as
+    <sup>4</sup>&frasl;<sub>5</sub>.
+
+
+Other renderers
+---------------
+
+Blackfriday is structured to allow alternative rendering engines. Here
+are a few of note:
+
+*   [github_flavored_markdown](https://pkg.go.dev/github.com/shurcooL/github_flavored_markdown):
+    provides a GitHub Flavored Markdown renderer with fenced code block
+    highlighting, clickable heading anchor links.
+
+    It's not customizable, and its goal is to produce HTML output
+    equivalent to the [GitHub Markdown API endpoint](https://developer.github.com/v3/markdown/#render-a-markdown-document-in-raw-mode),
+    except the rendering is performed locally.
+
+*   [markdownfmt](https://github.com/shurcooL/markdownfmt): like gofmt,
+    but for markdown.
+
+*   [LaTeX output](https://gitlab.com/ambrevar/blackfriday-latex):
+    renders output as LaTeX.
+
+*   [bfchroma](https://github.com/Depado/bfchroma/): provides convenience
+    integration with the [Chroma](https://github.com/alecthomas/chroma) code
+    highlighting library. bfchroma is only compatible with v2 of Blackfriday and
+    provides a drop-in renderer ready to use with Blackfriday, as well as
+    options and means for further customization.
+
+*   [Blackfriday-Confluence](https://github.com/kentaro-m/blackfriday-confluence): provides a [Confluence Wiki Markup](https://confluence.atlassian.com/doc/confluence-wiki-markup-251003035.html) renderer.
+
+*   [Blackfriday-Slack](https://github.com/karriereat/blackfriday-slack): converts markdown to slack message style
+
+
+TODO
+----
+
+*   More unit testing
+*   Improve Unicode support. It does not understand all Unicode
+    rules (about what constitutes a letter, a punctuation symbol,
+    etc.), so it may fail to detect word boundaries correctly in
+    some instances. It is safe on all UTF-8 input.
+
+
+License
+-------
+
+[Blackfriday is distributed under the Simplified BSD License](LICENSE.txt)
+
+
+   [1]: https://daringfireball.net/projects/markdown/ "Markdown"
+   [2]: https://golang.org/ "Go Language"
+   [3]: https://github.com/vmg/sundown "Sundown"
+   [4]: https://pkg.go.dev/github.com/russross/blackfriday/v2#Parse "Parse func"
+   [5]: https://github.com/microcosm-cc/bluemonday "Bluemonday"
+
+   [BuildV2SVG]: https://travis-ci.org/russross/blackfriday.svg?branch=v2
+   [BuildV2URL]: https://travis-ci.org/russross/blackfriday
+   [PkgGoDevV2SVG]: https://pkg.go.dev/badge/github.com/russross/blackfriday/v2
+   [PkgGoDevV2URL]: https://pkg.go.dev/github.com/russross/blackfriday/v2
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/block.go b/test/tools/vendor/github.com/russross/blackfriday/v2/block.go
new file mode 100644
index 000000000..dcd61e6e3
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/block.go
@@ -0,0 +1,1612 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+// Functions to parse block-level elements.
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"html"
+	"regexp"
+	"strings"
+	"unicode"
+)
+
+const (
+	charEntity = "&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});"
+	escapable  = "[!\"#$%&'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]"
+)
+
+var (
+	reBackslashOrAmp      = regexp.MustCompile("[\\&]")
+	reEntityOrEscapedChar = regexp.MustCompile("(?i)\\\\" + escapable + "|" + charEntity)
+)
+
+// Parse block-level data.
+// Note: this function and many that it calls assume that
+// the input buffer ends with a newline.
+func (p *Markdown) block(data []byte) {
+	// this is called recursively: enforce a maximum depth
+	if p.nesting >= p.maxNesting {
+		return
+	}
+	p.nesting++
+
+	// parse out one block-level construct at a time
+	for len(data) > 0 {
+		// prefixed heading:
+		//
+		// # Heading 1
+		// ## Heading 2
+		// ...
+		// ###### Heading 6
+		if p.isPrefixHeading(data) {
+			data = data[p.prefixHeading(data):]
+			continue
+		}
+
+		// block of preformatted HTML:
+		//
+		// <div>
+		//     ...
+		// </div>
+		if data[0] == '<' {
+			if i := p.html(data, true); i > 0 {
+				data = data[i:]
+				continue
+			}
+		}
+
+		// title block
+		//
+		// % stuff
+		// % more stuff
+		// % even more stuff
+		if p.extensions&Titleblock != 0 {
+			if data[0] == '%' {
+				if i := p.titleBlock(data, true); i > 0 {
+					data = data[i:]
+					continue
+				}
+			}
+		}
+
+		// blank lines.  note: returns the # of bytes to skip
+		if i := p.isEmpty(data); i > 0 {
+			data = data[i:]
+			continue
+		}
+
+		// indented code block:
+		//
+		//     func max(a, b int) int {
+		//         if a > b {
+		//             return a
+		//         }
+		//         return b
+		//      }
+		if p.codePrefix(data) > 0 {
+			data = data[p.code(data):]
+			continue
+		}
+
+		// fenced code block:
+		//
+		// ``` go
+		// func fact(n int) int {
+		//     if n <= 1 {
+		//         return n
+		//     }
+		//     return n * fact(n-1)
+		// }
+		// ```
+		if p.extensions&FencedCode != 0 {
+			if i := p.fencedCodeBlock(data, true); i > 0 {
+				data = data[i:]
+				continue
+			}
+		}
+
+		// horizontal rule:
+		//
+		// ------
+		// or
+		// ******
+		// or
+		// ______
+		if p.isHRule(data) {
+			p.addBlock(HorizontalRule, nil)
+			var i int
+			for i = 0; i < len(data) && data[i] != '\n'; i++ {
+			}
+			data = data[i:]
+			continue
+		}
+
+		// block quote:
+		//
+		// > A big quote I found somewhere
+		// > on the web
+		if p.quotePrefix(data) > 0 {
+			data = data[p.quote(data):]
+			continue
+		}
+
+		// table:
+		//
+		// Name  | Age | Phone
+		// ------|-----|---------
+		// Bob   | 31  | 555-1234
+		// Alice | 27  | 555-4321
+		if p.extensions&Tables != 0 {
+			if i := p.table(data); i > 0 {
+				data = data[i:]
+				continue
+			}
+		}
+
+		// an itemized/unordered list:
+		//
+		// * Item 1
+		// * Item 2
+		//
+		// also works with + or -
+		if p.uliPrefix(data) > 0 {
+			data = data[p.list(data, 0):]
+			continue
+		}
+
+		// a numbered/ordered list:
+		//
+		// 1. Item 1
+		// 2. Item 2
+		if p.oliPrefix(data) > 0 {
+			data = data[p.list(data, ListTypeOrdered):]
+			continue
+		}
+
+		// definition lists:
+		//
+		// Term 1
+		// :   Definition a
+		// :   Definition b
+		//
+		// Term 2
+		// :   Definition c
+		if p.extensions&DefinitionLists != 0 {
+			if p.dliPrefix(data) > 0 {
+				data = data[p.list(data, ListTypeDefinition):]
+				continue
+			}
+		}
+
+		// anything else must look like a normal paragraph
+		// note: this finds underlined headings, too
+		data = data[p.paragraph(data):]
+	}
+
+	p.nesting--
+}
+
+func (p *Markdown) addBlock(typ NodeType, content []byte) *Node {
+	p.closeUnmatchedBlocks()
+	container := p.addChild(typ, 0)
+	container.content = content
+	return container
+}
+
+func (p *Markdown) isPrefixHeading(data []byte) bool {
+	if data[0] != '#' {
+		return false
+	}
+
+	if p.extensions&SpaceHeadings != 0 {
+		level := 0
+		for level < 6 && level < len(data) && data[level] == '#' {
+			level++
+		}
+		if level == len(data) || data[level] != ' ' {
+			return false
+		}
+	}
+	return true
+}
+
+func (p *Markdown) prefixHeading(data []byte) int {
+	level := 0
+	for level < 6 && level < len(data) && data[level] == '#' {
+		level++
+	}
+	i := skipChar(data, level, ' ')
+	end := skipUntilChar(data, i, '\n')
+	skip := end
+	id := ""
+	if p.extensions&HeadingIDs != 0 {
+		j, k := 0, 0
+		// find start/end of heading id
+		for j = i; j < end-1 && (data[j] != '{' || data[j+1] != '#'); j++ {
+		}
+		for k = j + 1; k < end && data[k] != '}'; k++ {
+		}
+		// extract heading id iff found
+		if j < end && k < end {
+			id = string(data[j+2 : k])
+			end = j
+			skip = k + 1
+			for end > 0 && data[end-1] == ' ' {
+				end--
+			}
+		}
+	}
+	for end > 0 && data[end-1] == '#' {
+		if isBackslashEscaped(data, end-1) {
+			break
+		}
+		end--
+	}
+	for end > 0 && data[end-1] == ' ' {
+		end--
+	}
+	if end > i {
+		if id == "" && p.extensions&AutoHeadingIDs != 0 {
+			id = SanitizedAnchorName(string(data[i:end]))
+		}
+		block := p.addBlock(Heading, data[i:end])
+		block.HeadingID = id
+		block.Level = level
+	}
+	return skip
+}
+
+func (p *Markdown) isUnderlinedHeading(data []byte) int {
+	// test of level 1 heading
+	if data[0] == '=' {
+		i := skipChar(data, 1, '=')
+		i = skipChar(data, i, ' ')
+		if i < len(data) && data[i] == '\n' {
+			return 1
+		}
+		return 0
+	}
+
+	// test of level 2 heading
+	if data[0] == '-' {
+		i := skipChar(data, 1, '-')
+		i = skipChar(data, i, ' ')
+		if i < len(data) && data[i] == '\n' {
+			return 2
+		}
+		return 0
+	}
+
+	return 0
+}
+
+func (p *Markdown) titleBlock(data []byte, doRender bool) int {
+	if data[0] != '%' {
+		return 0
+	}
+	splitData := bytes.Split(data, []byte("\n"))
+	var i int
+	for idx, b := range splitData {
+		if !bytes.HasPrefix(b, []byte("%")) {
+			i = idx // - 1
+			break
+		}
+	}
+
+	data = bytes.Join(splitData[0:i], []byte("\n"))
+	consumed := len(data)
+	data = bytes.TrimPrefix(data, []byte("% "))
+	data = bytes.Replace(data, []byte("\n% "), []byte("\n"), -1)
+	block := p.addBlock(Heading, data)
+	block.Level = 1
+	block.IsTitleblock = true
+
+	return consumed
+}
+
+func (p *Markdown) html(data []byte, doRender bool) int {
+	var i, j int
+
+	// identify the opening tag
+	if data[0] != '<' {
+		return 0
+	}
+	curtag, tagfound := p.htmlFindTag(data[1:])
+
+	// handle special cases
+	if !tagfound {
+		// check for an HTML comment
+		if size := p.htmlComment(data, doRender); size > 0 {
+			return size
+		}
+
+		// check for an <hr> tag
+		if size := p.htmlHr(data, doRender); size > 0 {
+			return size
+		}
+
+		// no special case recognized
+		return 0
+	}
+
+	// look for an unindented matching closing tag
+	// followed by a blank line
+	found := false
+	/*
+		closetag := []byte("\n</" + curtag + ">")
+		j = len(curtag) + 1
+		for !found {
+			// scan for a closing tag at the beginning of a line
+			if skip := bytes.Index(data[j:], closetag); skip >= 0 {
+				j += skip + len(closetag)
+			} else {
+				break
+			}
+
+			// see if it is the only thing on the line
+			if skip := p.isEmpty(data[j:]); skip > 0 {
+				// see if it is followed by a blank line/eof
+				j += skip
+				if j >= len(data) {
+					found = true
+					i = j
+				} else {
+					if skip := p.isEmpty(data[j:]); skip > 0 {
+						j += skip
+						found = true
+						i = j
+					}
+				}
+			}
+		}
+	*/
+
+	// if not found, try a second pass looking for indented match
+	// but not if tag is "ins" or "del" (following original Markdown.pl)
+	if !found && curtag != "ins" && curtag != "del" {
+		i = 1
+		for i < len(data) {
+			i++
+			for i < len(data) && !(data[i-1] == '<' && data[i] == '/') {
+				i++
+			}
+
+			if i+2+len(curtag) >= len(data) {
+				break
+			}
+
+			j = p.htmlFindEnd(curtag, data[i-1:])
+
+			if j > 0 {
+				i += j - 1
+				found = true
+				break
+			}
+		}
+	}
+
+	if !found {
+		return 0
+	}
+
+	// the end of the block has been found
+	if doRender {
+		// trim newlines
+		end := i
+		for end > 0 && data[end-1] == '\n' {
+			end--
+		}
+		finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
+	}
+
+	return i
+}
+
+func finalizeHTMLBlock(block *Node) {
+	block.Literal = block.content
+	block.content = nil
+}
+
+// HTML comment, lax form
+func (p *Markdown) htmlComment(data []byte, doRender bool) int {
+	i := p.inlineHTMLComment(data)
+	// needs to end with a blank line
+	if j := p.isEmpty(data[i:]); j > 0 {
+		size := i + j
+		if doRender {
+			// trim trailing newlines
+			end := size
+			for end > 0 && data[end-1] == '\n' {
+				end--
+			}
+			block := p.addBlock(HTMLBlock, data[:end])
+			finalizeHTMLBlock(block)
+		}
+		return size
+	}
+	return 0
+}
+
+// HR, which is the only self-closing block tag considered
+func (p *Markdown) htmlHr(data []byte, doRender bool) int {
+	if len(data) < 4 {
+		return 0
+	}
+	if data[0] != '<' || (data[1] != 'h' && data[1] != 'H') || (data[2] != 'r' && data[2] != 'R') {
+		return 0
+	}
+	if data[3] != ' ' && data[3] != '/' && data[3] != '>' {
+		// not an <hr> tag after all; at least not a valid one
+		return 0
+	}
+	i := 3
+	for i < len(data) && data[i] != '>' && data[i] != '\n' {
+		i++
+	}
+	if i < len(data) && data[i] == '>' {
+		i++
+		if j := p.isEmpty(data[i:]); j > 0 {
+			size := i + j
+			if doRender {
+				// trim newlines
+				end := size
+				for end > 0 && data[end-1] == '\n' {
+					end--
+				}
+				finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
+			}
+			return size
+		}
+	}
+	return 0
+}
+
+func (p *Markdown) htmlFindTag(data []byte) (string, bool) {
+	i := 0
+	for i < len(data) && isalnum(data[i]) {
+		i++
+	}
+	key := string(data[:i])
+	if _, ok := blockTags[key]; ok {
+		return key, true
+	}
+	return "", false
+}
+
+func (p *Markdown) htmlFindEnd(tag string, data []byte) int {
+	// assume data[0] == '<' && data[1] == '/' already tested
+	if tag == "hr" {
+		return 2
+	}
+	// check if tag is a match
+	closetag := []byte("</" + tag + ">")
+	if !bytes.HasPrefix(data, closetag) {
+		return 0
+	}
+	i := len(closetag)
+
+	// check that the rest of the line is blank
+	skip := 0
+	if skip = p.isEmpty(data[i:]); skip == 0 {
+		return 0
+	}
+	i += skip
+	skip = 0
+
+	if i >= len(data) {
+		return i
+	}
+
+	if p.extensions&LaxHTMLBlocks != 0 {
+		return i
+	}
+	if skip = p.isEmpty(data[i:]); skip == 0 {
+		// following line must be blank
+		return 0
+	}
+
+	return i + skip
+}
+
+func (*Markdown) isEmpty(data []byte) int {
+	// it is okay to call isEmpty on an empty buffer
+	if len(data) == 0 {
+		return 0
+	}
+
+	var i int
+	for i = 0; i < len(data) && data[i] != '\n'; i++ {
+		if data[i] != ' ' && data[i] != '\t' {
+			return 0
+		}
+	}
+	if i < len(data) && data[i] == '\n' {
+		i++
+	}
+	return i
+}
+
+func (*Markdown) isHRule(data []byte) bool {
+	i := 0
+
+	// skip up to three spaces
+	for i < 3 && data[i] == ' ' {
+		i++
+	}
+
+	// look at the hrule char
+	if data[i] != '*' && data[i] != '-' && data[i] != '_' {
+		return false
+	}
+	c := data[i]
+
+	// the whole line must be the char or whitespace
+	n := 0
+	for i < len(data) && data[i] != '\n' {
+		switch {
+		case data[i] == c:
+			n++
+		case data[i] != ' ':
+			return false
+		}
+		i++
+	}
+
+	return n >= 3
+}
+
+// isFenceLine checks if there's a fence line (e.g., ``` or ``` go) at the beginning of data,
+// and returns the end index if so, or 0 otherwise. It also returns the marker found.
+// If info is not nil, it gets set to the syntax specified in the fence line.
+func isFenceLine(data []byte, info *string, oldmarker string) (end int, marker string) {
+	i, size := 0, 0
+
+	// skip up to three spaces
+	for i < len(data) && i < 3 && data[i] == ' ' {
+		i++
+	}
+
+	// check for the marker characters: ~ or `
+	if i >= len(data) {
+		return 0, ""
+	}
+	if data[i] != '~' && data[i] != '`' {
+		return 0, ""
+	}
+
+	c := data[i]
+
+	// the whole line must be the same char or whitespace
+	for i < len(data) && data[i] == c {
+		size++
+		i++
+	}
+
+	// the marker char must occur at least 3 times
+	if size < 3 {
+		return 0, ""
+	}
+	marker = string(data[i-size : i])
+
+	// if this is the end marker, it must match the beginning marker
+	if oldmarker != "" && marker != oldmarker {
+		return 0, ""
+	}
+
+	// TODO(shurcooL): It's probably a good idea to simplify the 2 code paths here
+	// into one, always get the info string, and discard it if the caller doesn't care.
+	if info != nil {
+		infoLength := 0
+		i = skipChar(data, i, ' ')
+
+		if i >= len(data) {
+			if i == len(data) {
+				return i, marker
+			}
+			return 0, ""
+		}
+
+		infoStart := i
+
+		if data[i] == '{' {
+			i++
+			infoStart++
+
+			for i < len(data) && data[i] != '}' && data[i] != '\n' {
+				infoLength++
+				i++
+			}
+
+			if i >= len(data) || data[i] != '}' {
+				return 0, ""
+			}
+
+			// strip all whitespace at the beginning and the end
+			// of the {} block
+			for infoLength > 0 && isspace(data[infoStart]) {
+				infoStart++
+				infoLength--
+			}
+
+			for infoLength > 0 && isspace(data[infoStart+infoLength-1]) {
+				infoLength--
+			}
+			i++
+			i = skipChar(data, i, ' ')
+		} else {
+			for i < len(data) && !isverticalspace(data[i]) {
+				infoLength++
+				i++
+			}
+		}
+
+		*info = strings.TrimSpace(string(data[infoStart : infoStart+infoLength]))
+	}
+
+	if i == len(data) {
+		return i, marker
+	}
+	if i > len(data) || data[i] != '\n' {
+		return 0, ""
+	}
+	return i + 1, marker // Take newline into account.
+}
+
+// fencedCodeBlock returns the end index if data contains a fenced code block at the beginning,
+// or 0 otherwise. It writes to out if doRender is true, otherwise it has no side effects.
+// If doRender is true, a final newline is mandatory to recognize the fenced code block.
+func (p *Markdown) fencedCodeBlock(data []byte, doRender bool) int {
+	var info string
+	beg, marker := isFenceLine(data, &info, "")
+	if beg == 0 || beg >= len(data) {
+		return 0
+	}
+	fenceLength := beg - 1
+
+	var work bytes.Buffer
+	work.Write([]byte(info))
+	work.WriteByte('\n')
+
+	for {
+		// safe to assume beg < len(data)
+
+		// check for the end of the code block
+		fenceEnd, _ := isFenceLine(data[beg:], nil, marker)
+		if fenceEnd != 0 {
+			beg += fenceEnd
+			break
+		}
+
+		// copy the current line
+		end := skipUntilChar(data, beg, '\n') + 1
+
+		// did we reach the end of the buffer without a closing marker?
+		if end >= len(data) {
+			return 0
+		}
+
+		// verbatim copy to the working buffer
+		if doRender {
+			work.Write(data[beg:end])
+		}
+		beg = end
+	}
+
+	if doRender {
+		block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
+		block.IsFenced = true
+		block.FenceLength = fenceLength
+		finalizeCodeBlock(block)
+	}
+
+	return beg
+}
+
+func unescapeChar(str []byte) []byte {
+	if str[0] == '\\' {
+		return []byte{str[1]}
+	}
+	return []byte(html.UnescapeString(string(str)))
+}
+
+func unescapeString(str []byte) []byte {
+	if reBackslashOrAmp.Match(str) {
+		return reEntityOrEscapedChar.ReplaceAllFunc(str, unescapeChar)
+	}
+	return str
+}
+
+func finalizeCodeBlock(block *Node) {
+	if block.IsFenced {
+		newlinePos := bytes.IndexByte(block.content, '\n')
+		firstLine := block.content[:newlinePos]
+		rest := block.content[newlinePos+1:]
+		block.Info = unescapeString(bytes.Trim(firstLine, "\n"))
+		block.Literal = rest
+	} else {
+		block.Literal = block.content
+	}
+	block.content = nil
+}
+
+func (p *Markdown) table(data []byte) int {
+	table := p.addBlock(Table, nil)
+	i, columns := p.tableHeader(data)
+	if i == 0 {
+		p.tip = table.Parent
+		table.Unlink()
+		return 0
+	}
+
+	p.addBlock(TableBody, nil)
+
+	for i < len(data) {
+		pipes, rowStart := 0, i
+		for ; i < len(data) && data[i] != '\n'; i++ {
+			if data[i] == '|' {
+				pipes++
+			}
+		}
+
+		if pipes == 0 {
+			i = rowStart
+			break
+		}
+
+		// include the newline in data sent to tableRow
+		if i < len(data) && data[i] == '\n' {
+			i++
+		}
+		p.tableRow(data[rowStart:i], columns, false)
+	}
+
+	return i
+}
+
+// check if the specified position is preceded by an odd number of backslashes
+func isBackslashEscaped(data []byte, i int) bool {
+	backslashes := 0
+	for i-backslashes-1 >= 0 && data[i-backslashes-1] == '\\' {
+		backslashes++
+	}
+	return backslashes&1 == 1
+}
+
+func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags) {
+	i := 0
+	colCount := 1
+	for i = 0; i < len(data) && data[i] != '\n'; i++ {
+		if data[i] == '|' && !isBackslashEscaped(data, i) {
+			colCount++
+		}
+	}
+
+	// doesn't look like a table header
+	if colCount == 1 {
+		return
+	}
+
+	// include the newline in the data sent to tableRow
+	j := i
+	if j < len(data) && data[j] == '\n' {
+		j++
+	}
+	header := data[:j]
+
+	// column count ignores pipes at beginning or end of line
+	if data[0] == '|' {
+		colCount--
+	}
+	if i > 2 && data[i-1] == '|' && !isBackslashEscaped(data, i-1) {
+		colCount--
+	}
+
+	columns = make([]CellAlignFlags, colCount)
+
+	// move on to the header underline
+	i++
+	if i >= len(data) {
+		return
+	}
+
+	if data[i] == '|' && !isBackslashEscaped(data, i) {
+		i++
+	}
+	i = skipChar(data, i, ' ')
+
+	// each column header is of form: / *:?-+:? *|/ with # dashes + # colons >= 3
+	// and trailing | optional on last column
+	col := 0
+	for i < len(data) && data[i] != '\n' {
+		dashes := 0
+
+		if data[i] == ':' {
+			i++
+			columns[col] |= TableAlignmentLeft
+			dashes++
+		}
+		for i < len(data) && data[i] == '-' {
+			i++
+			dashes++
+		}
+		if i < len(data) && data[i] == ':' {
+			i++
+			columns[col] |= TableAlignmentRight
+			dashes++
+		}
+		for i < len(data) && data[i] == ' ' {
+			i++
+		}
+		if i == len(data) {
+			return
+		}
+		// end of column test is messy
+		switch {
+		case dashes < 3:
+			// not a valid column
+			return
+
+		case data[i] == '|' && !isBackslashEscaped(data, i):
+			// marker found, now skip past trailing whitespace
+			col++
+			i++
+			for i < len(data) && data[i] == ' ' {
+				i++
+			}
+
+			// trailing junk found after last column
+			if col >= colCount && i < len(data) && data[i] != '\n' {
+				return
+			}
+
+		case (data[i] != '|' || isBackslashEscaped(data, i)) && col+1 < colCount:
+			// something else found where marker was required
+			return
+
+		case data[i] == '\n':
+			// marker is optional for the last column
+			col++
+
+		default:
+			// trailing junk found after last column
+			return
+		}
+	}
+	if col != colCount {
+		return
+	}
+
+	p.addBlock(TableHead, nil)
+	p.tableRow(header, columns, true)
+	size = i
+	if size < len(data) && data[size] == '\n' {
+		size++
+	}
+	return
+}
+
+func (p *Markdown) tableRow(data []byte, columns []CellAlignFlags, header bool) {
+	p.addBlock(TableRow, nil)
+	i, col := 0, 0
+
+	if data[i] == '|' && !isBackslashEscaped(data, i) {
+		i++
+	}
+
+	for col = 0; col < len(columns) && i < len(data); col++ {
+		for i < len(data) && data[i] == ' ' {
+			i++
+		}
+
+		cellStart := i
+
+		for i < len(data) && (data[i] != '|' || isBackslashEscaped(data, i)) && data[i] != '\n' {
+			i++
+		}
+
+		cellEnd := i
+
+		// skip the end-of-cell marker, possibly taking us past end of buffer
+		i++
+
+		for cellEnd > cellStart && cellEnd-1 < len(data) && data[cellEnd-1] == ' ' {
+			cellEnd--
+		}
+
+		cell := p.addBlock(TableCell, data[cellStart:cellEnd])
+		cell.IsHeader = header
+		cell.Align = columns[col]
+	}
+
+	// pad it out with empty columns to get the right number
+	for ; col < len(columns); col++ {
+		cell := p.addBlock(TableCell, nil)
+		cell.IsHeader = header
+		cell.Align = columns[col]
+	}
+
+	// silently ignore rows with too many cells
+}
+
+// returns blockquote prefix length
+func (p *Markdown) quotePrefix(data []byte) int {
+	i := 0
+	for i < 3 && i < len(data) && data[i] == ' ' {
+		i++
+	}
+	if i < len(data) && data[i] == '>' {
+		if i+1 < len(data) && data[i+1] == ' ' {
+			return i + 2
+		}
+		return i + 1
+	}
+	return 0
+}
+
+// blockquote ends with at least one blank line
+// followed by something without a blockquote prefix
+func (p *Markdown) terminateBlockquote(data []byte, beg, end int) bool {
+	if p.isEmpty(data[beg:]) <= 0 {
+		return false
+	}
+	if end >= len(data) {
+		return true
+	}
+	return p.quotePrefix(data[end:]) == 0 && p.isEmpty(data[end:]) == 0
+}
+
+// parse a blockquote fragment
+func (p *Markdown) quote(data []byte) int {
+	block := p.addBlock(BlockQuote, nil)
+	var raw bytes.Buffer
+	beg, end := 0, 0
+	for beg < len(data) {
+		end = beg
+		// Step over whole lines, collecting them. While doing that, check for
+		// fenced code and if one's found, incorporate it altogether,
+		// irregardless of any contents inside it
+		for end < len(data) && data[end] != '\n' {
+			if p.extensions&FencedCode != 0 {
+				if i := p.fencedCodeBlock(data[end:], false); i > 0 {
+					// -1 to compensate for the extra end++ after the loop:
+					end += i - 1
+					break
+				}
+			}
+			end++
+		}
+		if end < len(data) && data[end] == '\n' {
+			end++
+		}
+		if pre := p.quotePrefix(data[beg:]); pre > 0 {
+			// skip the prefix
+			beg += pre
+		} else if p.terminateBlockquote(data, beg, end) {
+			break
+		}
+		// this line is part of the blockquote
+		raw.Write(data[beg:end])
+		beg = end
+	}
+	p.block(raw.Bytes())
+	p.finalize(block)
+	return end
+}
+
+// returns prefix length for block code
+func (p *Markdown) codePrefix(data []byte) int {
+	if len(data) >= 1 && data[0] == '\t' {
+		return 1
+	}
+	if len(data) >= 4 && data[0] == ' ' && data[1] == ' ' && data[2] == ' ' && data[3] == ' ' {
+		return 4
+	}
+	return 0
+}
+
+func (p *Markdown) code(data []byte) int {
+	var work bytes.Buffer
+
+	i := 0
+	for i < len(data) {
+		beg := i
+		for i < len(data) && data[i] != '\n' {
+			i++
+		}
+		if i < len(data) && data[i] == '\n' {
+			i++
+		}
+
+		blankline := p.isEmpty(data[beg:i]) > 0
+		if pre := p.codePrefix(data[beg:i]); pre > 0 {
+			beg += pre
+		} else if !blankline {
+			// non-empty, non-prefixed line breaks the pre
+			i = beg
+			break
+		}
+
+		// verbatim copy to the working buffer
+		if blankline {
+			work.WriteByte('\n')
+		} else {
+			work.Write(data[beg:i])
+		}
+	}
+
+	// trim all the \n off the end of work
+	workbytes := work.Bytes()
+	eol := len(workbytes)
+	for eol > 0 && workbytes[eol-1] == '\n' {
+		eol--
+	}
+	if eol != len(workbytes) {
+		work.Truncate(eol)
+	}
+
+	work.WriteByte('\n')
+
+	block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
+	block.IsFenced = false
+	finalizeCodeBlock(block)
+
+	return i
+}
+
+// returns unordered list item prefix
+func (p *Markdown) uliPrefix(data []byte) int {
+	i := 0
+	// start with up to 3 spaces
+	for i < len(data) && i < 3 && data[i] == ' ' {
+		i++
+	}
+	if i >= len(data)-1 {
+		return 0
+	}
+	// need one of {'*', '+', '-'} followed by a space or a tab
+	if (data[i] != '*' && data[i] != '+' && data[i] != '-') ||
+		(data[i+1] != ' ' && data[i+1] != '\t') {
+		return 0
+	}
+	return i + 2
+}
+
+// returns ordered list item prefix
+func (p *Markdown) oliPrefix(data []byte) int {
+	i := 0
+
+	// start with up to 3 spaces
+	for i < 3 && i < len(data) && data[i] == ' ' {
+		i++
+	}
+
+	// count the digits
+	start := i
+	for i < len(data) && data[i] >= '0' && data[i] <= '9' {
+		i++
+	}
+	if start == i || i >= len(data)-1 {
+		return 0
+	}
+
+	// we need >= 1 digits followed by a dot and a space or a tab
+	if data[i] != '.' || !(data[i+1] == ' ' || data[i+1] == '\t') {
+		return 0
+	}
+	return i + 2
+}
+
+// returns definition list item prefix
+func (p *Markdown) dliPrefix(data []byte) int {
+	if len(data) < 2 {
+		return 0
+	}
+	i := 0
+	// need a ':' followed by a space or a tab
+	if data[i] != ':' || !(data[i+1] == ' ' || data[i+1] == '\t') {
+		return 0
+	}
+	for i < len(data) && data[i] == ' ' {
+		i++
+	}
+	return i + 2
+}
+
+// parse ordered or unordered list block
+func (p *Markdown) list(data []byte, flags ListType) int {
+	i := 0
+	flags |= ListItemBeginningOfList
+	block := p.addBlock(List, nil)
+	block.ListFlags = flags
+	block.Tight = true
+
+	for i < len(data) {
+		skip := p.listItem(data[i:], &flags)
+		if flags&ListItemContainsBlock != 0 {
+			block.ListData.Tight = false
+		}
+		i += skip
+		if skip == 0 || flags&ListItemEndOfList != 0 {
+			break
+		}
+		flags &= ^ListItemBeginningOfList
+	}
+
+	above := block.Parent
+	finalizeList(block)
+	p.tip = above
+	return i
+}
+
+// Returns true if the list item is not the same type as its parent list
+func (p *Markdown) listTypeChanged(data []byte, flags *ListType) bool {
+	if p.dliPrefix(data) > 0 && *flags&ListTypeDefinition == 0 {
+		return true
+	} else if p.oliPrefix(data) > 0 && *flags&ListTypeOrdered == 0 {
+		return true
+	} else if p.uliPrefix(data) > 0 && (*flags&ListTypeOrdered != 0 || *flags&ListTypeDefinition != 0) {
+		return true
+	}
+	return false
+}
+
+// Returns true if block ends with a blank line, descending if needed
+// into lists and sublists.
+func endsWithBlankLine(block *Node) bool {
+	// TODO: figure this out. Always false now.
+	for block != nil {
+		//if block.lastLineBlank {
+		//return true
+		//}
+		t := block.Type
+		if t == List || t == Item {
+			block = block.LastChild
+		} else {
+			break
+		}
+	}
+	return false
+}
+
+func finalizeList(block *Node) {
+	block.open = false
+	item := block.FirstChild
+	for item != nil {
+		// check for non-final list item ending with blank line:
+		if endsWithBlankLine(item) && item.Next != nil {
+			block.ListData.Tight = false
+			break
+		}
+		// recurse into children of list item, to see if there are spaces
+		// between any of them:
+		subItem := item.FirstChild
+		for subItem != nil {
+			if endsWithBlankLine(subItem) && (item.Next != nil || subItem.Next != nil) {
+				block.ListData.Tight = false
+				break
+			}
+			subItem = subItem.Next
+		}
+		item = item.Next
+	}
+}
+
+// Parse a single list item.
+// Assumes initial prefix is already removed if this is a sublist.
+func (p *Markdown) listItem(data []byte, flags *ListType) int {
+	// keep track of the indentation of the first line
+	itemIndent := 0
+	if data[0] == '\t' {
+		itemIndent += 4
+	} else {
+		for itemIndent < 3 && data[itemIndent] == ' ' {
+			itemIndent++
+		}
+	}
+
+	var bulletChar byte = '*'
+	i := p.uliPrefix(data)
+	if i == 0 {
+		i = p.oliPrefix(data)
+	} else {
+		bulletChar = data[i-2]
+	}
+	if i == 0 {
+		i = p.dliPrefix(data)
+		// reset definition term flag
+		if i > 0 {
+			*flags &= ^ListTypeTerm
+		}
+	}
+	if i == 0 {
+		// if in definition list, set term flag and continue
+		if *flags&ListTypeDefinition != 0 {
+			*flags |= ListTypeTerm
+		} else {
+			return 0
+		}
+	}
+
+	// skip leading whitespace on first line
+	for i < len(data) && data[i] == ' ' {
+		i++
+	}
+
+	// find the end of the line
+	line := i
+	for i > 0 && i < len(data) && data[i-1] != '\n' {
+		i++
+	}
+
+	// get working buffer
+	var raw bytes.Buffer
+
+	// put the first line into the working buffer
+	raw.Write(data[line:i])
+	line = i
+
+	// process the following lines
+	containsBlankLine := false
+	sublist := 0
+	codeBlockMarker := ""
+
+gatherlines:
+	for line < len(data) {
+		i++
+
+		// find the end of this line
+		for i < len(data) && data[i-1] != '\n' {
+			i++
+		}
+
+		// if it is an empty line, guess that it is part of this item
+		// and move on to the next line
+		if p.isEmpty(data[line:i]) > 0 {
+			containsBlankLine = true
+			line = i
+			continue
+		}
+
+		// calculate the indentation
+		indent := 0
+		indentIndex := 0
+		if data[line] == '\t' {
+			indentIndex++
+			indent += 4
+		} else {
+			for indent < 4 && line+indent < i && data[line+indent] == ' ' {
+				indent++
+				indentIndex++
+			}
+		}
+
+		chunk := data[line+indentIndex : i]
+
+		if p.extensions&FencedCode != 0 {
+			// determine if in or out of codeblock
+			// if in codeblock, ignore normal list processing
+			_, marker := isFenceLine(chunk, nil, codeBlockMarker)
+			if marker != "" {
+				if codeBlockMarker == "" {
+					// start of codeblock
+					codeBlockMarker = marker
+				} else {
+					// end of codeblock.
+					codeBlockMarker = ""
+				}
+			}
+			// we are in a codeblock, write line, and continue
+			if codeBlockMarker != "" || marker != "" {
+				raw.Write(data[line+indentIndex : i])
+				line = i
+				continue gatherlines
+			}
+		}
+
+		// evaluate how this line fits in
+		switch {
+		// is this a nested list item?
+		case (p.uliPrefix(chunk) > 0 && !p.isHRule(chunk)) ||
+			p.oliPrefix(chunk) > 0 ||
+			p.dliPrefix(chunk) > 0:
+
+			// to be a nested list, it must be indented more
+			// if not, it is either a different kind of list
+			// or the next item in the same list
+			if indent <= itemIndent {
+				if p.listTypeChanged(chunk, flags) {
+					*flags |= ListItemEndOfList
+				} else if containsBlankLine {
+					*flags |= ListItemContainsBlock
+				}
+
+				break gatherlines
+			}
+
+			if containsBlankLine {
+				*flags |= ListItemContainsBlock
+			}
+
+			// is this the first item in the nested list?
+			if sublist == 0 {
+				sublist = raw.Len()
+			}
+
+		// is this a nested prefix heading?
+		case p.isPrefixHeading(chunk):
+			// if the heading is not indented, it is not nested in the list
+			// and thus ends the list
+			if containsBlankLine && indent < 4 {
+				*flags |= ListItemEndOfList
+				break gatherlines
+			}
+			*flags |= ListItemContainsBlock
+
+		// anything following an empty line is only part
+		// of this item if it is indented 4 spaces
+		// (regardless of the indentation of the beginning of the item)
+		case containsBlankLine && indent < 4:
+			if *flags&ListTypeDefinition != 0 && i < len(data)-1 {
+				// is the next item still a part of this list?
+				next := i
+				for next < len(data) && data[next] != '\n' {
+					next++
+				}
+				for next < len(data)-1 && data[next] == '\n' {
+					next++
+				}
+				if i < len(data)-1 && data[i] != ':' && data[next] != ':' {
+					*flags |= ListItemEndOfList
+				}
+			} else {
+				*flags |= ListItemEndOfList
+			}
+			break gatherlines
+
+		// a blank line means this should be parsed as a block
+		case containsBlankLine:
+			raw.WriteByte('\n')
+			*flags |= ListItemContainsBlock
+		}
+
+		// if this line was preceded by one or more blanks,
+		// re-introduce the blank into the buffer
+		if containsBlankLine {
+			containsBlankLine = false
+			raw.WriteByte('\n')
+		}
+
+		// add the line into the working buffer without prefix
+		raw.Write(data[line+indentIndex : i])
+
+		line = i
+	}
+
+	rawBytes := raw.Bytes()
+
+	block := p.addBlock(Item, nil)
+	block.ListFlags = *flags
+	block.Tight = false
+	block.BulletChar = bulletChar
+	block.Delimiter = '.' // Only '.' is possible in Markdown, but ')' will also be possible in CommonMark
+
+	// render the contents of the list item
+	if *flags&ListItemContainsBlock != 0 && *flags&ListTypeTerm == 0 {
+		// intermediate render of block item, except for definition term
+		if sublist > 0 {
+			p.block(rawBytes[:sublist])
+			p.block(rawBytes[sublist:])
+		} else {
+			p.block(rawBytes)
+		}
+	} else {
+		// intermediate render of inline item
+		if sublist > 0 {
+			child := p.addChild(Paragraph, 0)
+			child.content = rawBytes[:sublist]
+			p.block(rawBytes[sublist:])
+		} else {
+			child := p.addChild(Paragraph, 0)
+			child.content = rawBytes
+		}
+	}
+	return line
+}
+
+// render a single paragraph that has already been parsed out
+func (p *Markdown) renderParagraph(data []byte) {
+	if len(data) == 0 {
+		return
+	}
+
+	// trim leading spaces
+	beg := 0
+	for data[beg] == ' ' {
+		beg++
+	}
+
+	end := len(data)
+	// trim trailing newline
+	if data[len(data)-1] == '\n' {
+		end--
+	}
+
+	// trim trailing spaces
+	for end > beg && data[end-1] == ' ' {
+		end--
+	}
+
+	p.addBlock(Paragraph, data[beg:end])
+}
+
+func (p *Markdown) paragraph(data []byte) int {
+	// prev: index of 1st char of previous line
+	// line: index of 1st char of current line
+	// i: index of cursor/end of current line
+	var prev, line, i int
+	tabSize := TabSizeDefault
+	if p.extensions&TabSizeEight != 0 {
+		tabSize = TabSizeDouble
+	}
+	// keep going until we find something to mark the end of the paragraph
+	for i < len(data) {
+		// mark the beginning of the current line
+		prev = line
+		current := data[i:]
+		line = i
+
+		// did we find a reference or a footnote? If so, end a paragraph
+		// preceding it and report that we have consumed up to the end of that
+		// reference:
+		if refEnd := isReference(p, current, tabSize); refEnd > 0 {
+			p.renderParagraph(data[:i])
+			return i + refEnd
+		}
+
+		// did we find a blank line marking the end of the paragraph?
+		if n := p.isEmpty(current); n > 0 {
+			// did this blank line followed by a definition list item?
+			if p.extensions&DefinitionLists != 0 {
+				if i < len(data)-1 && data[i+1] == ':' {
+					return p.list(data[prev:], ListTypeDefinition)
+				}
+			}
+
+			p.renderParagraph(data[:i])
+			return i + n
+		}
+
+		// an underline under some text marks a heading, so our paragraph ended on prev line
+		if i > 0 {
+			if level := p.isUnderlinedHeading(current); level > 0 {
+				// render the paragraph
+				p.renderParagraph(data[:prev])
+
+				// ignore leading and trailing whitespace
+				eol := i - 1
+				for prev < eol && data[prev] == ' ' {
+					prev++
+				}
+				for eol > prev && data[eol-1] == ' ' {
+					eol--
+				}
+
+				id := ""
+				if p.extensions&AutoHeadingIDs != 0 {
+					id = SanitizedAnchorName(string(data[prev:eol]))
+				}
+
+				block := p.addBlock(Heading, data[prev:eol])
+				block.Level = level
+				block.HeadingID = id
+
+				// find the end of the underline
+				for i < len(data) && data[i] != '\n' {
+					i++
+				}
+				return i
+			}
+		}
+
+		// if the next line starts a block of HTML, then the paragraph ends here
+		if p.extensions&LaxHTMLBlocks != 0 {
+			if data[i] == '<' && p.html(current, false) > 0 {
+				// rewind to before the HTML block
+				p.renderParagraph(data[:i])
+				return i
+			}
+		}
+
+		// if there's a prefixed heading or a horizontal rule after this, paragraph is over
+		if p.isPrefixHeading(current) || p.isHRule(current) {
+			p.renderParagraph(data[:i])
+			return i
+		}
+
+		// if there's a fenced code block, paragraph is over
+		if p.extensions&FencedCode != 0 {
+			if p.fencedCodeBlock(current, false) > 0 {
+				p.renderParagraph(data[:i])
+				return i
+			}
+		}
+
+		// if there's a definition list item, prev line is a definition term
+		if p.extensions&DefinitionLists != 0 {
+			if p.dliPrefix(current) != 0 {
+				ret := p.list(data[prev:], ListTypeDefinition)
+				return ret
+			}
+		}
+
+		// if there's a list after this, paragraph is over
+		if p.extensions&NoEmptyLineBeforeBlock != 0 {
+			if p.uliPrefix(current) != 0 ||
+				p.oliPrefix(current) != 0 ||
+				p.quotePrefix(current) != 0 ||
+				p.codePrefix(current) != 0 {
+				p.renderParagraph(data[:i])
+				return i
+			}
+		}
+
+		// otherwise, scan to the beginning of the next line
+		nl := bytes.IndexByte(data[i:], '\n')
+		if nl >= 0 {
+			i += nl + 1
+		} else {
+			i += len(data[i:])
+		}
+	}
+
+	p.renderParagraph(data[:i])
+	return i
+}
+
+func skipChar(data []byte, start int, char byte) int {
+	i := start
+	for i < len(data) && data[i] == char {
+		i++
+	}
+	return i
+}
+
+func skipUntilChar(text []byte, start int, char byte) int {
+	i := start
+	for i < len(text) && text[i] != char {
+		i++
+	}
+	return i
+}
+
+// SanitizedAnchorName returns a sanitized anchor name for the given text.
+//
+// It implements the algorithm specified in the package comment.
+func SanitizedAnchorName(text string) string {
+	var anchorName []rune
+	futureDash := false
+	for _, r := range text {
+		switch {
+		case unicode.IsLetter(r) || unicode.IsNumber(r):
+			if futureDash && len(anchorName) > 0 {
+				anchorName = append(anchorName, '-')
+			}
+			futureDash = false
+			anchorName = append(anchorName, unicode.ToLower(r))
+		default:
+			futureDash = true
+		}
+	}
+	return string(anchorName)
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/doc.go b/test/tools/vendor/github.com/russross/blackfriday/v2/doc.go
new file mode 100644
index 000000000..57ff152a0
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/doc.go
@@ -0,0 +1,46 @@
+// Package blackfriday is a markdown processor.
+//
+// It translates plain text with simple formatting rules into an AST, which can
+// then be further processed to HTML (provided by Blackfriday itself) or other
+// formats (provided by the community).
+//
+// The simplest way to invoke Blackfriday is to call the Run function. It will
+// take a text input and produce a text output in HTML (or other format).
+//
+// A slightly more sophisticated way to use Blackfriday is to create a Markdown
+// processor and to call Parse, which returns a syntax tree for the input
+// document. You can leverage Blackfriday's parsing for content extraction from
+// markdown documents. You can assign a custom renderer and set various options
+// to the Markdown processor.
+//
+// If you're interested in calling Blackfriday from command line, see
+// https://github.com/russross/blackfriday-tool.
+//
+// Sanitized Anchor Names
+//
+// Blackfriday includes an algorithm for creating sanitized anchor names
+// corresponding to a given input text. This algorithm is used to create
+// anchors for headings when AutoHeadingIDs extension is enabled. The
+// algorithm is specified below, so that other packages can create
+// compatible anchor names and links to those anchors.
+//
+// The algorithm iterates over the input text, interpreted as UTF-8,
+// one Unicode code point (rune) at a time. All runes that are letters (category L)
+// or numbers (category N) are considered valid characters. They are mapped to
+// lower case, and included in the output. All other runes are considered
+// invalid characters. Invalid characters that precede the first valid character,
+// as well as invalid character that follow the last valid character
+// are dropped completely. All other sequences of invalid characters
+// between two valid characters are replaced with a single dash character '-'.
+//
+// SanitizedAnchorName exposes this functionality, and can be used to
+// create compatible links to the anchor names generated by blackfriday.
+// This algorithm is also implemented in a small standalone package at
+// github.com/shurcooL/sanitized_anchor_name. It can be useful for clients
+// that want a small package and don't need full functionality of blackfriday.
+package blackfriday
+
+// NOTE: Keep Sanitized Anchor Name algorithm in sync with package
+//       github.com/shurcooL/sanitized_anchor_name.
+//       Otherwise, users of sanitized_anchor_name will get anchor names
+//       that are incompatible with those generated by blackfriday.
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/entities.go b/test/tools/vendor/github.com/russross/blackfriday/v2/entities.go
new file mode 100644
index 000000000..a2c3edb69
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/entities.go
@@ -0,0 +1,2236 @@
+package blackfriday
+
+// Extracted from https://html.spec.whatwg.org/multipage/entities.json
+var entities = map[string]bool{
+	"&AElig":                            true,
+	"&AElig;":                           true,
+	"&AMP":                              true,
+	"&AMP;":                             true,
+	"&Aacute":                           true,
+	"&Aacute;":                          true,
+	"&Abreve;":                          true,
+	"&Acirc":                            true,
+	"&Acirc;":                           true,
+	"&Acy;":                             true,
+	"&Afr;":                             true,
+	"&Agrave":                           true,
+	"&Agrave;":                          true,
+	"&Alpha;":                           true,
+	"&Amacr;":                           true,
+	"&And;":                             true,
+	"&Aogon;":                           true,
+	"&Aopf;":                            true,
+	"&ApplyFunction;":                   true,
+	"&Aring":                            true,
+	"&Aring;":                           true,
+	"&Ascr;":                            true,
+	"&Assign;":                          true,
+	"&Atilde":                           true,
+	"&Atilde;":                          true,
+	"&Auml":                             true,
+	"&Auml;":                            true,
+	"&Backslash;":                       true,
+	"&Barv;":                            true,
+	"&Barwed;":                          true,
+	"&Bcy;":                             true,
+	"&Because;":                         true,
+	"&Bernoullis;":                      true,
+	"&Beta;":                            true,
+	"&Bfr;":                             true,
+	"&Bopf;":                            true,
+	"&Breve;":                           true,
+	"&Bscr;":                            true,
+	"&Bumpeq;":                          true,
+	"&CHcy;":                            true,
+	"&COPY":                             true,
+	"&COPY;":                            true,
+	"&Cacute;":                          true,
+	"&Cap;":                             true,
+	"&CapitalDifferentialD;":            true,
+	"&Cayleys;":                         true,
+	"&Ccaron;":                          true,
+	"&Ccedil":                           true,
+	"&Ccedil;":                          true,
+	"&Ccirc;":                           true,
+	"&Cconint;":                         true,
+	"&Cdot;":                            true,
+	"&Cedilla;":                         true,
+	"&CenterDot;":                       true,
+	"&Cfr;":                             true,
+	"&Chi;":                             true,
+	"&CircleDot;":                       true,
+	"&CircleMinus;":                     true,
+	"&CirclePlus;":                      true,
+	"&CircleTimes;":                     true,
+	"&ClockwiseContourIntegral;":        true,
+	"&CloseCurlyDoubleQuote;":           true,
+	"&CloseCurlyQuote;":                 true,
+	"&Colon;":                           true,
+	"&Colone;":                          true,
+	"&Congruent;":                       true,
+	"&Conint;":                          true,
+	"&ContourIntegral;":                 true,
+	"&Copf;":                            true,
+	"&Coproduct;":                       true,
+	"&CounterClockwiseContourIntegral;": true,
+	"&Cross;":                           true,
+	"&Cscr;":                            true,
+	"&Cup;":                             true,
+	"&CupCap;":                          true,
+	"&DD;":                              true,
+	"&DDotrahd;":                        true,
+	"&DJcy;":                            true,
+	"&DScy;":                            true,
+	"&DZcy;":                            true,
+	"&Dagger;":                          true,
+	"&Darr;":                            true,
+	"&Dashv;":                           true,
+	"&Dcaron;":                          true,
+	"&Dcy;":                             true,
+	"&Del;":                             true,
+	"&Delta;":                           true,
+	"&Dfr;":                             true,
+	"&DiacriticalAcute;":                true,
+	"&DiacriticalDot;":                  true,
+	"&DiacriticalDoubleAcute;":          true,
+	"&DiacriticalGrave;":                true,
+	"&DiacriticalTilde;":                true,
+	"&Diamond;":                         true,
+	"&DifferentialD;":                   true,
+	"&Dopf;":                            true,
+	"&Dot;":                             true,
+	"&DotDot;":                          true,
+	"&DotEqual;":                        true,
+	"&DoubleContourIntegral;":           true,
+	"&DoubleDot;":                       true,
+	"&DoubleDownArrow;":                 true,
+	"&DoubleLeftArrow;":                 true,
+	"&DoubleLeftRightArrow;":            true,
+	"&DoubleLeftTee;":                   true,
+	"&DoubleLongLeftArrow;":             true,
+	"&DoubleLongLeftRightArrow;":        true,
+	"&DoubleLongRightArrow;":            true,
+	"&DoubleRightArrow;":                true,
+	"&DoubleRightTee;":                  true,
+	"&DoubleUpArrow;":                   true,
+	"&DoubleUpDownArrow;":               true,
+	"&DoubleVerticalBar;":               true,
+	"&DownArrow;":                       true,
+	"&DownArrowBar;":                    true,
+	"&DownArrowUpArrow;":                true,
+	"&DownBreve;":                       true,
+	"&DownLeftRightVector;":             true,
+	"&DownLeftTeeVector;":               true,
+	"&DownLeftVector;":                  true,
+	"&DownLeftVectorBar;":               true,
+	"&DownRightTeeVector;":              true,
+	"&DownRightVector;":                 true,
+	"&DownRightVectorBar;":              true,
+	"&DownTee;":                         true,
+	"&DownTeeArrow;":                    true,
+	"&Downarrow;":                       true,
+	"&Dscr;":                            true,
+	"&Dstrok;":                          true,
+	"&ENG;":                             true,
+	"&ETH":                              true,
+	"&ETH;":                             true,
+	"&Eacute":                           true,
+	"&Eacute;":                          true,
+	"&Ecaron;":                          true,
+	"&Ecirc":                            true,
+	"&Ecirc;":                           true,
+	"&Ecy;":                             true,
+	"&Edot;":                            true,
+	"&Efr;":                             true,
+	"&Egrave":                           true,
+	"&Egrave;":                          true,
+	"&Element;":                         true,
+	"&Emacr;":                           true,
+	"&EmptySmallSquare;":                true,
+	"&EmptyVerySmallSquare;":            true,
+	"&Eogon;":                           true,
+	"&Eopf;":                            true,
+	"&Epsilon;":                         true,
+	"&Equal;":                           true,
+	"&EqualTilde;":                      true,
+	"&Equilibrium;":                     true,
+	"&Escr;":                            true,
+	"&Esim;":                            true,
+	"&Eta;":                             true,
+	"&Euml":                             true,
+	"&Euml;":                            true,
+	"&Exists;":                          true,
+	"&ExponentialE;":                    true,
+	"&Fcy;":                             true,
+	"&Ffr;":                             true,
+	"&FilledSmallSquare;":               true,
+	"&FilledVerySmallSquare;":           true,
+	"&Fopf;":                            true,
+	"&ForAll;":                          true,
+	"&Fouriertrf;":                      true,
+	"&Fscr;":                            true,
+	"&GJcy;":                            true,
+	"&GT":                               true,
+	"&GT;":                              true,
+	"&Gamma;":                           true,
+	"&Gammad;":                          true,
+	"&Gbreve;":                          true,
+	"&Gcedil;":                          true,
+	"&Gcirc;":                           true,
+	"&Gcy;":                             true,
+	"&Gdot;":                            true,
+	"&Gfr;":                             true,
+	"&Gg;":                              true,
+	"&Gopf;":                            true,
+	"&GreaterEqual;":                    true,
+	"&GreaterEqualLess;":                true,
+	"&GreaterFullEqual;":                true,
+	"&GreaterGreater;":                  true,
+	"&GreaterLess;":                     true,
+	"&GreaterSlantEqual;":               true,
+	"&GreaterTilde;":                    true,
+	"&Gscr;":                            true,
+	"&Gt;":                              true,
+	"&HARDcy;":                          true,
+	"&Hacek;":                           true,
+	"&Hat;":                             true,
+	"&Hcirc;":                           true,
+	"&Hfr;":                             true,
+	"&HilbertSpace;":                    true,
+	"&Hopf;":                            true,
+	"&HorizontalLine;":                  true,
+	"&Hscr;":                            true,
+	"&Hstrok;":                          true,
+	"&HumpDownHump;":                    true,
+	"&HumpEqual;":                       true,
+	"&IEcy;":                            true,
+	"&IJlig;":                           true,
+	"&IOcy;":                            true,
+	"&Iacute":                           true,
+	"&Iacute;":                          true,
+	"&Icirc":                            true,
+	"&Icirc;":                           true,
+	"&Icy;":                             true,
+	"&Idot;":                            true,
+	"&Ifr;":                             true,
+	"&Igrave":                           true,
+	"&Igrave;":                          true,
+	"&Im;":                              true,
+	"&Imacr;":                           true,
+	"&ImaginaryI;":                      true,
+	"&Implies;":                         true,
+	"&Int;":                             true,
+	"&Integral;":                        true,
+	"&Intersection;":                    true,
+	"&InvisibleComma;":                  true,
+	"&InvisibleTimes;":                  true,
+	"&Iogon;":                           true,
+	"&Iopf;":                            true,
+	"&Iota;":                            true,
+	"&Iscr;":                            true,
+	"&Itilde;":                          true,
+	"&Iukcy;":                           true,
+	"&Iuml":                             true,
+	"&Iuml;":                            true,
+	"&Jcirc;":                           true,
+	"&Jcy;":                             true,
+	"&Jfr;":                             true,
+	"&Jopf;":                            true,
+	"&Jscr;":                            true,
+	"&Jsercy;":                          true,
+	"&Jukcy;":                           true,
+	"&KHcy;":                            true,
+	"&KJcy;":                            true,
+	"&Kappa;":                           true,
+	"&Kcedil;":                          true,
+	"&Kcy;":                             true,
+	"&Kfr;":                             true,
+	"&Kopf;":                            true,
+	"&Kscr;":                            true,
+	"&LJcy;":                            true,
+	"&LT":                               true,
+	"&LT;":                              true,
+	"&Lacute;":                          true,
+	"&Lambda;":                          true,
+	"&Lang;":                            true,
+	"&Laplacetrf;":                      true,
+	"&Larr;":                            true,
+	"&Lcaron;":                          true,
+	"&Lcedil;":                          true,
+	"&Lcy;":                             true,
+	"&LeftAngleBracket;":                true,
+	"&LeftArrow;":                       true,
+	"&LeftArrowBar;":                    true,
+	"&LeftArrowRightArrow;":             true,
+	"&LeftCeiling;":                     true,
+	"&LeftDoubleBracket;":               true,
+	"&LeftDownTeeVector;":               true,
+	"&LeftDownVector;":                  true,
+	"&LeftDownVectorBar;":               true,
+	"&LeftFloor;":                       true,
+	"&LeftRightArrow;":                  true,
+	"&LeftRightVector;":                 true,
+	"&LeftTee;":                         true,
+	"&LeftTeeArrow;":                    true,
+	"&LeftTeeVector;":                   true,
+	"&LeftTriangle;":                    true,
+	"&LeftTriangleBar;":                 true,
+	"&LeftTriangleEqual;":               true,
+	"&LeftUpDownVector;":                true,
+	"&LeftUpTeeVector;":                 true,
+	"&LeftUpVector;":                    true,
+	"&LeftUpVectorBar;":                 true,
+	"&LeftVector;":                      true,
+	"&LeftVectorBar;":                   true,
+	"&Leftarrow;":                       true,
+	"&Leftrightarrow;":                  true,
+	"&LessEqualGreater;":                true,
+	"&LessFullEqual;":                   true,
+	"&LessGreater;":                     true,
+	"&LessLess;":                        true,
+	"&LessSlantEqual;":                  true,
+	"&LessTilde;":                       true,
+	"&Lfr;":                             true,
+	"&Ll;":                              true,
+	"&Lleftarrow;":                      true,
+	"&Lmidot;":                          true,
+	"&LongLeftArrow;":                   true,
+	"&LongLeftRightArrow;":              true,
+	"&LongRightArrow;":                  true,
+	"&Longleftarrow;":                   true,
+	"&Longleftrightarrow;":              true,
+	"&Longrightarrow;":                  true,
+	"&Lopf;":                            true,
+	"&LowerLeftArrow;":                  true,
+	"&LowerRightArrow;":                 true,
+	"&Lscr;":                            true,
+	"&Lsh;":                             true,
+	"&Lstrok;":                          true,
+	"&Lt;":                              true,
+	"&Map;":                             true,
+	"&Mcy;":                             true,
+	"&MediumSpace;":                     true,
+	"&Mellintrf;":                       true,
+	"&Mfr;":                             true,
+	"&MinusPlus;":                       true,
+	"&Mopf;":                            true,
+	"&Mscr;":                            true,
+	"&Mu;":                              true,
+	"&NJcy;":                            true,
+	"&Nacute;":                          true,
+	"&Ncaron;":                          true,
+	"&Ncedil;":                          true,
+	"&Ncy;":                             true,
+	"&NegativeMediumSpace;":             true,
+	"&NegativeThickSpace;":              true,
+	"&NegativeThinSpace;":               true,
+	"&NegativeVeryThinSpace;":           true,
+	"&NestedGreaterGreater;":            true,
+	"&NestedLessLess;":                  true,
+	"&NewLine;":                         true,
+	"&Nfr;":                             true,
+	"&NoBreak;":                         true,
+	"&NonBreakingSpace;":                true,
+	"&Nopf;":                            true,
+	"&Not;":                             true,
+	"&NotCongruent;":                    true,
+	"&NotCupCap;":                       true,
+	"&NotDoubleVerticalBar;":            true,
+	"&NotElement;":                      true,
+	"&NotEqual;":                        true,
+	"&NotEqualTilde;":                   true,
+	"&NotExists;":                       true,
+	"&NotGreater;":                      true,
+	"&NotGreaterEqual;":                 true,
+	"&NotGreaterFullEqual;":             true,
+	"&NotGreaterGreater;":               true,
+	"&NotGreaterLess;":                  true,
+	"&NotGreaterSlantEqual;":            true,
+	"&NotGreaterTilde;":                 true,
+	"&NotHumpDownHump;":                 true,
+	"&NotHumpEqual;":                    true,
+	"&NotLeftTriangle;":                 true,
+	"&NotLeftTriangleBar;":              true,
+	"&NotLeftTriangleEqual;":            true,
+	"&NotLess;":                         true,
+	"&NotLessEqual;":                    true,
+	"&NotLessGreater;":                  true,
+	"&NotLessLess;":                     true,
+	"&NotLessSlantEqual;":               true,
+	"&NotLessTilde;":                    true,
+	"&NotNestedGreaterGreater;":         true,
+	"&NotNestedLessLess;":               true,
+	"&NotPrecedes;":                     true,
+	"&NotPrecedesEqual;":                true,
+	"&NotPrecedesSlantEqual;":           true,
+	"&NotReverseElement;":               true,
+	"&NotRightTriangle;":                true,
+	"&NotRightTriangleBar;":             true,
+	"&NotRightTriangleEqual;":           true,
+	"&NotSquareSubset;":                 true,
+	"&NotSquareSubsetEqual;":            true,
+	"&NotSquareSuperset;":               true,
+	"&NotSquareSupersetEqual;":          true,
+	"&NotSubset;":                       true,
+	"&NotSubsetEqual;":                  true,
+	"&NotSucceeds;":                     true,
+	"&NotSucceedsEqual;":                true,
+	"&NotSucceedsSlantEqual;":           true,
+	"&NotSucceedsTilde;":                true,
+	"&NotSuperset;":                     true,
+	"&NotSupersetEqual;":                true,
+	"&NotTilde;":                        true,
+	"&NotTildeEqual;":                   true,
+	"&NotTildeFullEqual;":               true,
+	"&NotTildeTilde;":                   true,
+	"&NotVerticalBar;":                  true,
+	"&Nscr;":                            true,
+	"&Ntilde":                           true,
+	"&Ntilde;":                          true,
+	"&Nu;":                              true,
+	"&OElig;":                           true,
+	"&Oacute":                           true,
+	"&Oacute;":                          true,
+	"&Ocirc":                            true,
+	"&Ocirc;":                           true,
+	"&Ocy;":                             true,
+	"&Odblac;":                          true,
+	"&Ofr;":                             true,
+	"&Ograve":                           true,
+	"&Ograve;":                          true,
+	"&Omacr;":                           true,
+	"&Omega;":                           true,
+	"&Omicron;":                         true,
+	"&Oopf;":                            true,
+	"&OpenCurlyDoubleQuote;":            true,
+	"&OpenCurlyQuote;":                  true,
+	"&Or;":                              true,
+	"&Oscr;":                            true,
+	"&Oslash":                           true,
+	"&Oslash;":                          true,
+	"&Otilde":                           true,
+	"&Otilde;":                          true,
+	"&Otimes;":                          true,
+	"&Ouml":                             true,
+	"&Ouml;":                            true,
+	"&OverBar;":                         true,
+	"&OverBrace;":                       true,
+	"&OverBracket;":                     true,
+	"&OverParenthesis;":                 true,
+	"&PartialD;":                        true,
+	"&Pcy;":                             true,
+	"&Pfr;":                             true,
+	"&Phi;":                             true,
+	"&Pi;":                              true,
+	"&PlusMinus;":                       true,
+	"&Poincareplane;":                   true,
+	"&Popf;":                            true,
+	"&Pr;":                              true,
+	"&Precedes;":                        true,
+	"&PrecedesEqual;":                   true,
+	"&PrecedesSlantEqual;":              true,
+	"&PrecedesTilde;":                   true,
+	"&Prime;":                           true,
+	"&Product;":                         true,
+	"&Proportion;":                      true,
+	"&Proportional;":                    true,
+	"&Pscr;":                            true,
+	"&Psi;":                             true,
+	"&QUOT":                             true,
+	"&QUOT;":                            true,
+	"&Qfr;":                             true,
+	"&Qopf;":                            true,
+	"&Qscr;":                            true,
+	"&RBarr;":                           true,
+	"&REG":                              true,
+	"&REG;":                             true,
+	"&Racute;":                          true,
+	"&Rang;":                            true,
+	"&Rarr;":                            true,
+	"&Rarrtl;":                          true,
+	"&Rcaron;":                          true,
+	"&Rcedil;":                          true,
+	"&Rcy;":                             true,
+	"&Re;":                              true,
+	"&ReverseElement;":                  true,
+	"&ReverseEquilibrium;":              true,
+	"&ReverseUpEquilibrium;":            true,
+	"&Rfr;":                             true,
+	"&Rho;":                             true,
+	"&RightAngleBracket;":               true,
+	"&RightArrow;":                      true,
+	"&RightArrowBar;":                   true,
+	"&RightArrowLeftArrow;":             true,
+	"&RightCeiling;":                    true,
+	"&RightDoubleBracket;":              true,
+	"&RightDownTeeVector;":              true,
+	"&RightDownVector;":                 true,
+	"&RightDownVectorBar;":              true,
+	"&RightFloor;":                      true,
+	"&RightTee;":                        true,
+	"&RightTeeArrow;":                   true,
+	"&RightTeeVector;":                  true,
+	"&RightTriangle;":                   true,
+	"&RightTriangleBar;":                true,
+	"&RightTriangleEqual;":              true,
+	"&RightUpDownVector;":               true,
+	"&RightUpTeeVector;":                true,
+	"&RightUpVector;":                   true,
+	"&RightUpVectorBar;":                true,
+	"&RightVector;":                     true,
+	"&RightVectorBar;":                  true,
+	"&Rightarrow;":                      true,
+	"&Ropf;":                            true,
+	"&RoundImplies;":                    true,
+	"&Rrightarrow;":                     true,
+	"&Rscr;":                            true,
+	"&Rsh;":                             true,
+	"&RuleDelayed;":                     true,
+	"&SHCHcy;":                          true,
+	"&SHcy;":                            true,
+	"&SOFTcy;":                          true,
+	"&Sacute;":                          true,
+	"&Sc;":                              true,
+	"&Scaron;":                          true,
+	"&Scedil;":                          true,
+	"&Scirc;":                           true,
+	"&Scy;":                             true,
+	"&Sfr;":                             true,
+	"&ShortDownArrow;":                  true,
+	"&ShortLeftArrow;":                  true,
+	"&ShortRightArrow;":                 true,
+	"&ShortUpArrow;":                    true,
+	"&Sigma;":                           true,
+	"&SmallCircle;":                     true,
+	"&Sopf;":                            true,
+	"&Sqrt;":                            true,
+	"&Square;":                          true,
+	"&SquareIntersection;":              true,
+	"&SquareSubset;":                    true,
+	"&SquareSubsetEqual;":               true,
+	"&SquareSuperset;":                  true,
+	"&SquareSupersetEqual;":             true,
+	"&SquareUnion;":                     true,
+	"&Sscr;":                            true,
+	"&Star;":                            true,
+	"&Sub;":                             true,
+	"&Subset;":                          true,
+	"&SubsetEqual;":                     true,
+	"&Succeeds;":                        true,
+	"&SucceedsEqual;":                   true,
+	"&SucceedsSlantEqual;":              true,
+	"&SucceedsTilde;":                   true,
+	"&SuchThat;":                        true,
+	"&Sum;":                             true,
+	"&Sup;":                             true,
+	"&Superset;":                        true,
+	"&SupersetEqual;":                   true,
+	"&Supset;":                          true,
+	"&THORN":                            true,
+	"&THORN;":                           true,
+	"&TRADE;":                           true,
+	"&TSHcy;":                           true,
+	"&TScy;":                            true,
+	"&Tab;":                             true,
+	"&Tau;":                             true,
+	"&Tcaron;":                          true,
+	"&Tcedil;":                          true,
+	"&Tcy;":                             true,
+	"&Tfr;":                             true,
+	"&Therefore;":                       true,
+	"&Theta;":                           true,
+	"&ThickSpace;":                      true,
+	"&ThinSpace;":                       true,
+	"&Tilde;":                           true,
+	"&TildeEqual;":                      true,
+	"&TildeFullEqual;":                  true,
+	"&TildeTilde;":                      true,
+	"&Topf;":                            true,
+	"&TripleDot;":                       true,
+	"&Tscr;":                            true,
+	"&Tstrok;":                          true,
+	"&Uacute":                           true,
+	"&Uacute;":                          true,
+	"&Uarr;":                            true,
+	"&Uarrocir;":                        true,
+	"&Ubrcy;":                           true,
+	"&Ubreve;":                          true,
+	"&Ucirc":                            true,
+	"&Ucirc;":                           true,
+	"&Ucy;":                             true,
+	"&Udblac;":                          true,
+	"&Ufr;":                             true,
+	"&Ugrave":                           true,
+	"&Ugrave;":                          true,
+	"&Umacr;":                           true,
+	"&UnderBar;":                        true,
+	"&UnderBrace;":                      true,
+	"&UnderBracket;":                    true,
+	"&UnderParenthesis;":                true,
+	"&Union;":                           true,
+	"&UnionPlus;":                       true,
+	"&Uogon;":                           true,
+	"&Uopf;":                            true,
+	"&UpArrow;":                         true,
+	"&UpArrowBar;":                      true,
+	"&UpArrowDownArrow;":                true,
+	"&UpDownArrow;":                     true,
+	"&UpEquilibrium;":                   true,
+	"&UpTee;":                           true,
+	"&UpTeeArrow;":                      true,
+	"&Uparrow;":                         true,
+	"&Updownarrow;":                     true,
+	"&UpperLeftArrow;":                  true,
+	"&UpperRightArrow;":                 true,
+	"&Upsi;":                            true,
+	"&Upsilon;":                         true,
+	"&Uring;":                           true,
+	"&Uscr;":                            true,
+	"&Utilde;":                          true,
+	"&Uuml":                             true,
+	"&Uuml;":                            true,
+	"&VDash;":                           true,
+	"&Vbar;":                            true,
+	"&Vcy;":                             true,
+	"&Vdash;":                           true,
+	"&Vdashl;":                          true,
+	"&Vee;":                             true,
+	"&Verbar;":                          true,
+	"&Vert;":                            true,
+	"&VerticalBar;":                     true,
+	"&VerticalLine;":                    true,
+	"&VerticalSeparator;":               true,
+	"&VerticalTilde;":                   true,
+	"&VeryThinSpace;":                   true,
+	"&Vfr;":                             true,
+	"&Vopf;":                            true,
+	"&Vscr;":                            true,
+	"&Vvdash;":                          true,
+	"&Wcirc;":                           true,
+	"&Wedge;":                           true,
+	"&Wfr;":                             true,
+	"&Wopf;":                            true,
+	"&Wscr;":                            true,
+	"&Xfr;":                             true,
+	"&Xi;":                              true,
+	"&Xopf;":                            true,
+	"&Xscr;":                            true,
+	"&YAcy;":                            true,
+	"&YIcy;":                            true,
+	"&YUcy;":                            true,
+	"&Yacute":                           true,
+	"&Yacute;":                          true,
+	"&Ycirc;":                           true,
+	"&Ycy;":                             true,
+	"&Yfr;":                             true,
+	"&Yopf;":                            true,
+	"&Yscr;":                            true,
+	"&Yuml;":                            true,
+	"&ZHcy;":                            true,
+	"&Zacute;":                          true,
+	"&Zcaron;":                          true,
+	"&Zcy;":                             true,
+	"&Zdot;":                            true,
+	"&ZeroWidthSpace;":                  true,
+	"&Zeta;":                            true,
+	"&Zfr;":                             true,
+	"&Zopf;":                            true,
+	"&Zscr;":                            true,
+	"&aacute":                           true,
+	"&aacute;":                          true,
+	"&abreve;":                          true,
+	"&ac;":                              true,
+	"&acE;":                             true,
+	"&acd;":                             true,
+	"&acirc":                            true,
+	"&acirc;":                           true,
+	"&acute":                            true,
+	"&acute;":                           true,
+	"&acy;":                             true,
+	"&aelig":                            true,
+	"&aelig;":                           true,
+	"&af;":                              true,
+	"&afr;":                             true,
+	"&agrave":                           true,
+	"&agrave;":                          true,
+	"&alefsym;":                         true,
+	"&aleph;":                           true,
+	"&alpha;":                           true,
+	"&amacr;":                           true,
+	"&amalg;":                           true,
+	"&amp":                              true,
+	"&amp;":                             true,
+	"&and;":                             true,
+	"&andand;":                          true,
+	"&andd;":                            true,
+	"&andslope;":                        true,
+	"&andv;":                            true,
+	"&ang;":                             true,
+	"&ange;":                            true,
+	"&angle;":                           true,
+	"&angmsd;":                          true,
+	"&angmsdaa;":                        true,
+	"&angmsdab;":                        true,
+	"&angmsdac;":                        true,
+	"&angmsdad;":                        true,
+	"&angmsdae;":                        true,
+	"&angmsdaf;":                        true,
+	"&angmsdag;":                        true,
+	"&angmsdah;":                        true,
+	"&angrt;":                           true,
+	"&angrtvb;":                         true,
+	"&angrtvbd;":                        true,
+	"&angsph;":                          true,
+	"&angst;":                           true,
+	"&angzarr;":                         true,
+	"&aogon;":                           true,
+	"&aopf;":                            true,
+	"&ap;":                              true,
+	"&apE;":                             true,
+	"&apacir;":                          true,
+	"&ape;":                             true,
+	"&apid;":                            true,
+	"&apos;":                            true,
+	"&approx;":                          true,
+	"&approxeq;":                        true,
+	"&aring":                            true,
+	"&aring;":                           true,
+	"&ascr;":                            true,
+	"&ast;":                             true,
+	"&asymp;":                           true,
+	"&asympeq;":                         true,
+	"&atilde":                           true,
+	"&atilde;":                          true,
+	"&auml":                             true,
+	"&auml;":                            true,
+	"&awconint;":                        true,
+	"&awint;":                           true,
+	"&bNot;":                            true,
+	"&backcong;":                        true,
+	"&backepsilon;":                     true,
+	"&backprime;":                       true,
+	"&backsim;":                         true,
+	"&backsimeq;":                       true,
+	"&barvee;":                          true,
+	"&barwed;":                          true,
+	"&barwedge;":                        true,
+	"&bbrk;":                            true,
+	"&bbrktbrk;":                        true,
+	"&bcong;":                           true,
+	"&bcy;":                             true,
+	"&bdquo;":                           true,
+	"&becaus;":                          true,
+	"&because;":                         true,
+	"&bemptyv;":                         true,
+	"&bepsi;":                           true,
+	"&bernou;":                          true,
+	"&beta;":                            true,
+	"&beth;":                            true,
+	"&between;":                         true,
+	"&bfr;":                             true,
+	"&bigcap;":                          true,
+	"&bigcirc;":                         true,
+	"&bigcup;":                          true,
+	"&bigodot;":                         true,
+	"&bigoplus;":                        true,
+	"&bigotimes;":                       true,
+	"&bigsqcup;":                        true,
+	"&bigstar;":                         true,
+	"&bigtriangledown;":                 true,
+	"&bigtriangleup;":                   true,
+	"&biguplus;":                        true,
+	"&bigvee;":                          true,
+	"&bigwedge;":                        true,
+	"&bkarow;":                          true,
+	"&blacklozenge;":                    true,
+	"&blacksquare;":                     true,
+	"&blacktriangle;":                   true,
+	"&blacktriangledown;":               true,
+	"&blacktriangleleft;":               true,
+	"&blacktriangleright;":              true,
+	"&blank;":                           true,
+	"&blk12;":                           true,
+	"&blk14;":                           true,
+	"&blk34;":                           true,
+	"&block;":                           true,
+	"&bne;":                             true,
+	"&bnequiv;":                         true,
+	"&bnot;":                            true,
+	"&bopf;":                            true,
+	"&bot;":                             true,
+	"&bottom;":                          true,
+	"&bowtie;":                          true,
+	"&boxDL;":                           true,
+	"&boxDR;":                           true,
+	"&boxDl;":                           true,
+	"&boxDr;":                           true,
+	"&boxH;":                            true,
+	"&boxHD;":                           true,
+	"&boxHU;":                           true,
+	"&boxHd;":                           true,
+	"&boxHu;":                           true,
+	"&boxUL;":                           true,
+	"&boxUR;":                           true,
+	"&boxUl;":                           true,
+	"&boxUr;":                           true,
+	"&boxV;":                            true,
+	"&boxVH;":                           true,
+	"&boxVL;":                           true,
+	"&boxVR;":                           true,
+	"&boxVh;":                           true,
+	"&boxVl;":                           true,
+	"&boxVr;":                           true,
+	"&boxbox;":                          true,
+	"&boxdL;":                           true,
+	"&boxdR;":                           true,
+	"&boxdl;":                           true,
+	"&boxdr;":                           true,
+	"&boxh;":                            true,
+	"&boxhD;":                           true,
+	"&boxhU;":                           true,
+	"&boxhd;":                           true,
+	"&boxhu;":                           true,
+	"&boxminus;":                        true,
+	"&boxplus;":                         true,
+	"&boxtimes;":                        true,
+	"&boxuL;":                           true,
+	"&boxuR;":                           true,
+	"&boxul;":                           true,
+	"&boxur;":                           true,
+	"&boxv;":                            true,
+	"&boxvH;":                           true,
+	"&boxvL;":                           true,
+	"&boxvR;":                           true,
+	"&boxvh;":                           true,
+	"&boxvl;":                           true,
+	"&boxvr;":                           true,
+	"&bprime;":                          true,
+	"&breve;":                           true,
+	"&brvbar":                           true,
+	"&brvbar;":                          true,
+	"&bscr;":                            true,
+	"&bsemi;":                           true,
+	"&bsim;":                            true,
+	"&bsime;":                           true,
+	"&bsol;":                            true,
+	"&bsolb;":                           true,
+	"&bsolhsub;":                        true,
+	"&bull;":                            true,
+	"&bullet;":                          true,
+	"&bump;":                            true,
+	"&bumpE;":                           true,
+	"&bumpe;":                           true,
+	"&bumpeq;":                          true,
+	"&cacute;":                          true,
+	"&cap;":                             true,
+	"&capand;":                          true,
+	"&capbrcup;":                        true,
+	"&capcap;":                          true,
+	"&capcup;":                          true,
+	"&capdot;":                          true,
+	"&caps;":                            true,
+	"&caret;":                           true,
+	"&caron;":                           true,
+	"&ccaps;":                           true,
+	"&ccaron;":                          true,
+	"&ccedil":                           true,
+	"&ccedil;":                          true,
+	"&ccirc;":                           true,
+	"&ccups;":                           true,
+	"&ccupssm;":                         true,
+	"&cdot;":                            true,
+	"&cedil":                            true,
+	"&cedil;":                           true,
+	"&cemptyv;":                         true,
+	"&cent":                             true,
+	"&cent;":                            true,
+	"&centerdot;":                       true,
+	"&cfr;":                             true,
+	"&chcy;":                            true,
+	"&check;":                           true,
+	"&checkmark;":                       true,
+	"&chi;":                             true,
+	"&cir;":                             true,
+	"&cirE;":                            true,
+	"&circ;":                            true,
+	"&circeq;":                          true,
+	"&circlearrowleft;":                 true,
+	"&circlearrowright;":                true,
+	"&circledR;":                        true,
+	"&circledS;":                        true,
+	"&circledast;":                      true,
+	"&circledcirc;":                     true,
+	"&circleddash;":                     true,
+	"&cire;":                            true,
+	"&cirfnint;":                        true,
+	"&cirmid;":                          true,
+	"&cirscir;":                         true,
+	"&clubs;":                           true,
+	"&clubsuit;":                        true,
+	"&colon;":                           true,
+	"&colone;":                          true,
+	"&coloneq;":                         true,
+	"&comma;":                           true,
+	"&commat;":                          true,
+	"&comp;":                            true,
+	"&compfn;":                          true,
+	"&complement;":                      true,
+	"&complexes;":                       true,
+	"&cong;":                            true,
+	"&congdot;":                         true,
+	"&conint;":                          true,
+	"&copf;":                            true,
+	"&coprod;":                          true,
+	"&copy":                             true,
+	"&copy;":                            true,
+	"&copysr;":                          true,
+	"&crarr;":                           true,
+	"&cross;":                           true,
+	"&cscr;":                            true,
+	"&csub;":                            true,
+	"&csube;":                           true,
+	"&csup;":                            true,
+	"&csupe;":                           true,
+	"&ctdot;":                           true,
+	"&cudarrl;":                         true,
+	"&cudarrr;":                         true,
+	"&cuepr;":                           true,
+	"&cuesc;":                           true,
+	"&cularr;":                          true,
+	"&cularrp;":                         true,
+	"&cup;":                             true,
+	"&cupbrcap;":                        true,
+	"&cupcap;":                          true,
+	"&cupcup;":                          true,
+	"&cupdot;":                          true,
+	"&cupor;":                           true,
+	"&cups;":                            true,
+	"&curarr;":                          true,
+	"&curarrm;":                         true,
+	"&curlyeqprec;":                     true,
+	"&curlyeqsucc;":                     true,
+	"&curlyvee;":                        true,
+	"&curlywedge;":                      true,
+	"&curren":                           true,
+	"&curren;":                          true,
+	"&curvearrowleft;":                  true,
+	"&curvearrowright;":                 true,
+	"&cuvee;":                           true,
+	"&cuwed;":                           true,
+	"&cwconint;":                        true,
+	"&cwint;":                           true,
+	"&cylcty;":                          true,
+	"&dArr;":                            true,
+	"&dHar;":                            true,
+	"&dagger;":                          true,
+	"&daleth;":                          true,
+	"&darr;":                            true,
+	"&dash;":                            true,
+	"&dashv;":                           true,
+	"&dbkarow;":                         true,
+	"&dblac;":                           true,
+	"&dcaron;":                          true,
+	"&dcy;":                             true,
+	"&dd;":                              true,
+	"&ddagger;":                         true,
+	"&ddarr;":                           true,
+	"&ddotseq;":                         true,
+	"&deg":                              true,
+	"&deg;":                             true,
+	"&delta;":                           true,
+	"&demptyv;":                         true,
+	"&dfisht;":                          true,
+	"&dfr;":                             true,
+	"&dharl;":                           true,
+	"&dharr;":                           true,
+	"&diam;":                            true,
+	"&diamond;":                         true,
+	"&diamondsuit;":                     true,
+	"&diams;":                           true,
+	"&die;":                             true,
+	"&digamma;":                         true,
+	"&disin;":                           true,
+	"&div;":                             true,
+	"&divide":                           true,
+	"&divide;":                          true,
+	"&divideontimes;":                   true,
+	"&divonx;":                          true,
+	"&djcy;":                            true,
+	"&dlcorn;":                          true,
+	"&dlcrop;":                          true,
+	"&dollar;":                          true,
+	"&dopf;":                            true,
+	"&dot;":                             true,
+	"&doteq;":                           true,
+	"&doteqdot;":                        true,
+	"&dotminus;":                        true,
+	"&dotplus;":                         true,
+	"&dotsquare;":                       true,
+	"&doublebarwedge;":                  true,
+	"&downarrow;":                       true,
+	"&downdownarrows;":                  true,
+	"&downharpoonleft;":                 true,
+	"&downharpoonright;":                true,
+	"&drbkarow;":                        true,
+	"&drcorn;":                          true,
+	"&drcrop;":                          true,
+	"&dscr;":                            true,
+	"&dscy;":                            true,
+	"&dsol;":                            true,
+	"&dstrok;":                          true,
+	"&dtdot;":                           true,
+	"&dtri;":                            true,
+	"&dtrif;":                           true,
+	"&duarr;":                           true,
+	"&duhar;":                           true,
+	"&dwangle;":                         true,
+	"&dzcy;":                            true,
+	"&dzigrarr;":                        true,
+	"&eDDot;":                           true,
+	"&eDot;":                            true,
+	"&eacute":                           true,
+	"&eacute;":                          true,
+	"&easter;":                          true,
+	"&ecaron;":                          true,
+	"&ecir;":                            true,
+	"&ecirc":                            true,
+	"&ecirc;":                           true,
+	"&ecolon;":                          true,
+	"&ecy;":                             true,
+	"&edot;":                            true,
+	"&ee;":                              true,
+	"&efDot;":                           true,
+	"&efr;":                             true,
+	"&eg;":                              true,
+	"&egrave":                           true,
+	"&egrave;":                          true,
+	"&egs;":                             true,
+	"&egsdot;":                          true,
+	"&el;":                              true,
+	"&elinters;":                        true,
+	"&ell;":                             true,
+	"&els;":                             true,
+	"&elsdot;":                          true,
+	"&emacr;":                           true,
+	"&empty;":                           true,
+	"&emptyset;":                        true,
+	"&emptyv;":                          true,
+	"&emsp13;":                          true,
+	"&emsp14;":                          true,
+	"&emsp;":                            true,
+	"&eng;":                             true,
+	"&ensp;":                            true,
+	"&eogon;":                           true,
+	"&eopf;":                            true,
+	"&epar;":                            true,
+	"&eparsl;":                          true,
+	"&eplus;":                           true,
+	"&epsi;":                            true,
+	"&epsilon;":                         true,
+	"&epsiv;":                           true,
+	"&eqcirc;":                          true,
+	"&eqcolon;":                         true,
+	"&eqsim;":                           true,
+	"&eqslantgtr;":                      true,
+	"&eqslantless;":                     true,
+	"&equals;":                          true,
+	"&equest;":                          true,
+	"&equiv;":                           true,
+	"&equivDD;":                         true,
+	"&eqvparsl;":                        true,
+	"&erDot;":                           true,
+	"&erarr;":                           true,
+	"&escr;":                            true,
+	"&esdot;":                           true,
+	"&esim;":                            true,
+	"&eta;":                             true,
+	"&eth":                              true,
+	"&eth;":                             true,
+	"&euml":                             true,
+	"&euml;":                            true,
+	"&euro;":                            true,
+	"&excl;":                            true,
+	"&exist;":                           true,
+	"&expectation;":                     true,
+	"&exponentiale;":                    true,
+	"&fallingdotseq;":                   true,
+	"&fcy;":                             true,
+	"&female;":                          true,
+	"&ffilig;":                          true,
+	"&fflig;":                           true,
+	"&ffllig;":                          true,
+	"&ffr;":                             true,
+	"&filig;":                           true,
+	"&fjlig;":                           true,
+	"&flat;":                            true,
+	"&fllig;":                           true,
+	"&fltns;":                           true,
+	"&fnof;":                            true,
+	"&fopf;":                            true,
+	"&forall;":                          true,
+	"&fork;":                            true,
+	"&forkv;":                           true,
+	"&fpartint;":                        true,
+	"&frac12":                           true,
+	"&frac12;":                          true,
+	"&frac13;":                          true,
+	"&frac14":                           true,
+	"&frac14;":                          true,
+	"&frac15;":                          true,
+	"&frac16;":                          true,
+	"&frac18;":                          true,
+	"&frac23;":                          true,
+	"&frac25;":                          true,
+	"&frac34":                           true,
+	"&frac34;":                          true,
+	"&frac35;":                          true,
+	"&frac38;":                          true,
+	"&frac45;":                          true,
+	"&frac56;":                          true,
+	"&frac58;":                          true,
+	"&frac78;":                          true,
+	"&frasl;":                           true,
+	"&frown;":                           true,
+	"&fscr;":                            true,
+	"&gE;":                              true,
+	"&gEl;":                             true,
+	"&gacute;":                          true,
+	"&gamma;":                           true,
+	"&gammad;":                          true,
+	"&gap;":                             true,
+	"&gbreve;":                          true,
+	"&gcirc;":                           true,
+	"&gcy;":                             true,
+	"&gdot;":                            true,
+	"&ge;":                              true,
+	"&gel;":                             true,
+	"&geq;":                             true,
+	"&geqq;":                            true,
+	"&geqslant;":                        true,
+	"&ges;":                             true,
+	"&gescc;":                           true,
+	"&gesdot;":                          true,
+	"&gesdoto;":                         true,
+	"&gesdotol;":                        true,
+	"&gesl;":                            true,
+	"&gesles;":                          true,
+	"&gfr;":                             true,
+	"&gg;":                              true,
+	"&ggg;":                             true,
+	"&gimel;":                           true,
+	"&gjcy;":                            true,
+	"&gl;":                              true,
+	"&glE;":                             true,
+	"&gla;":                             true,
+	"&glj;":                             true,
+	"&gnE;":                             true,
+	"&gnap;":                            true,
+	"&gnapprox;":                        true,
+	"&gne;":                             true,
+	"&gneq;":                            true,
+	"&gneqq;":                           true,
+	"&gnsim;":                           true,
+	"&gopf;":                            true,
+	"&grave;":                           true,
+	"&gscr;":                            true,
+	"&gsim;":                            true,
+	"&gsime;":                           true,
+	"&gsiml;":                           true,
+	"&gt":                               true,
+	"&gt;":                              true,
+	"&gtcc;":                            true,
+	"&gtcir;":                           true,
+	"&gtdot;":                           true,
+	"&gtlPar;":                          true,
+	"&gtquest;":                         true,
+	"&gtrapprox;":                       true,
+	"&gtrarr;":                          true,
+	"&gtrdot;":                          true,
+	"&gtreqless;":                       true,
+	"&gtreqqless;":                      true,
+	"&gtrless;":                         true,
+	"&gtrsim;":                          true,
+	"&gvertneqq;":                       true,
+	"&gvnE;":                            true,
+	"&hArr;":                            true,
+	"&hairsp;":                          true,
+	"&half;":                            true,
+	"&hamilt;":                          true,
+	"&hardcy;":                          true,
+	"&harr;":                            true,
+	"&harrcir;":                         true,
+	"&harrw;":                           true,
+	"&hbar;":                            true,
+	"&hcirc;":                           true,
+	"&hearts;":                          true,
+	"&heartsuit;":                       true,
+	"&hellip;":                          true,
+	"&hercon;":                          true,
+	"&hfr;":                             true,
+	"&hksearow;":                        true,
+	"&hkswarow;":                        true,
+	"&hoarr;":                           true,
+	"&homtht;":                          true,
+	"&hookleftarrow;":                   true,
+	"&hookrightarrow;":                  true,
+	"&hopf;":                            true,
+	"&horbar;":                          true,
+	"&hscr;":                            true,
+	"&hslash;":                          true,
+	"&hstrok;":                          true,
+	"&hybull;":                          true,
+	"&hyphen;":                          true,
+	"&iacute":                           true,
+	"&iacute;":                          true,
+	"&ic;":                              true,
+	"&icirc":                            true,
+	"&icirc;":                           true,
+	"&icy;":                             true,
+	"&iecy;":                            true,
+	"&iexcl":                            true,
+	"&iexcl;":                           true,
+	"&iff;":                             true,
+	"&ifr;":                             true,
+	"&igrave":                           true,
+	"&igrave;":                          true,
+	"&ii;":                              true,
+	"&iiiint;":                          true,
+	"&iiint;":                           true,
+	"&iinfin;":                          true,
+	"&iiota;":                           true,
+	"&ijlig;":                           true,
+	"&imacr;":                           true,
+	"&image;":                           true,
+	"&imagline;":                        true,
+	"&imagpart;":                        true,
+	"&imath;":                           true,
+	"&imof;":                            true,
+	"&imped;":                           true,
+	"&in;":                              true,
+	"&incare;":                          true,
+	"&infin;":                           true,
+	"&infintie;":                        true,
+	"&inodot;":                          true,
+	"&int;":                             true,
+	"&intcal;":                          true,
+	"&integers;":                        true,
+	"&intercal;":                        true,
+	"&intlarhk;":                        true,
+	"&intprod;":                         true,
+	"&iocy;":                            true,
+	"&iogon;":                           true,
+	"&iopf;":                            true,
+	"&iota;":                            true,
+	"&iprod;":                           true,
+	"&iquest":                           true,
+	"&iquest;":                          true,
+	"&iscr;":                            true,
+	"&isin;":                            true,
+	"&isinE;":                           true,
+	"&isindot;":                         true,
+	"&isins;":                           true,
+	"&isinsv;":                          true,
+	"&isinv;":                           true,
+	"&it;":                              true,
+	"&itilde;":                          true,
+	"&iukcy;":                           true,
+	"&iuml":                             true,
+	"&iuml;":                            true,
+	"&jcirc;":                           true,
+	"&jcy;":                             true,
+	"&jfr;":                             true,
+	"&jmath;":                           true,
+	"&jopf;":                            true,
+	"&jscr;":                            true,
+	"&jsercy;":                          true,
+	"&jukcy;":                           true,
+	"&kappa;":                           true,
+	"&kappav;":                          true,
+	"&kcedil;":                          true,
+	"&kcy;":                             true,
+	"&kfr;":                             true,
+	"&kgreen;":                          true,
+	"&khcy;":                            true,
+	"&kjcy;":                            true,
+	"&kopf;":                            true,
+	"&kscr;":                            true,
+	"&lAarr;":                           true,
+	"&lArr;":                            true,
+	"&lAtail;":                          true,
+	"&lBarr;":                           true,
+	"&lE;":                              true,
+	"&lEg;":                             true,
+	"&lHar;":                            true,
+	"&lacute;":                          true,
+	"&laemptyv;":                        true,
+	"&lagran;":                          true,
+	"&lambda;":                          true,
+	"&lang;":                            true,
+	"&langd;":                           true,
+	"&langle;":                          true,
+	"&lap;":                             true,
+	"&laquo":                            true,
+	"&laquo;":                           true,
+	"&larr;":                            true,
+	"&larrb;":                           true,
+	"&larrbfs;":                         true,
+	"&larrfs;":                          true,
+	"&larrhk;":                          true,
+	"&larrlp;":                          true,
+	"&larrpl;":                          true,
+	"&larrsim;":                         true,
+	"&larrtl;":                          true,
+	"&lat;":                             true,
+	"&latail;":                          true,
+	"&late;":                            true,
+	"&lates;":                           true,
+	"&lbarr;":                           true,
+	"&lbbrk;":                           true,
+	"&lbrace;":                          true,
+	"&lbrack;":                          true,
+	"&lbrke;":                           true,
+	"&lbrksld;":                         true,
+	"&lbrkslu;":                         true,
+	"&lcaron;":                          true,
+	"&lcedil;":                          true,
+	"&lceil;":                           true,
+	"&lcub;":                            true,
+	"&lcy;":                             true,
+	"&ldca;":                            true,
+	"&ldquo;":                           true,
+	"&ldquor;":                          true,
+	"&ldrdhar;":                         true,
+	"&ldrushar;":                        true,
+	"&ldsh;":                            true,
+	"&le;":                              true,
+	"&leftarrow;":                       true,
+	"&leftarrowtail;":                   true,
+	"&leftharpoondown;":                 true,
+	"&leftharpoonup;":                   true,
+	"&leftleftarrows;":                  true,
+	"&leftrightarrow;":                  true,
+	"&leftrightarrows;":                 true,
+	"&leftrightharpoons;":               true,
+	"&leftrightsquigarrow;":             true,
+	"&leftthreetimes;":                  true,
+	"&leg;":                             true,
+	"&leq;":                             true,
+	"&leqq;":                            true,
+	"&leqslant;":                        true,
+	"&les;":                             true,
+	"&lescc;":                           true,
+	"&lesdot;":                          true,
+	"&lesdoto;":                         true,
+	"&lesdotor;":                        true,
+	"&lesg;":                            true,
+	"&lesges;":                          true,
+	"&lessapprox;":                      true,
+	"&lessdot;":                         true,
+	"&lesseqgtr;":                       true,
+	"&lesseqqgtr;":                      true,
+	"&lessgtr;":                         true,
+	"&lesssim;":                         true,
+	"&lfisht;":                          true,
+	"&lfloor;":                          true,
+	"&lfr;":                             true,
+	"&lg;":                              true,
+	"&lgE;":                             true,
+	"&lhard;":                           true,
+	"&lharu;":                           true,
+	"&lharul;":                          true,
+	"&lhblk;":                           true,
+	"&ljcy;":                            true,
+	"&ll;":                              true,
+	"&llarr;":                           true,
+	"&llcorner;":                        true,
+	"&llhard;":                          true,
+	"&lltri;":                           true,
+	"&lmidot;":                          true,
+	"&lmoust;":                          true,
+	"&lmoustache;":                      true,
+	"&lnE;":                             true,
+	"&lnap;":                            true,
+	"&lnapprox;":                        true,
+	"&lne;":                             true,
+	"&lneq;":                            true,
+	"&lneqq;":                           true,
+	"&lnsim;":                           true,
+	"&loang;":                           true,
+	"&loarr;":                           true,
+	"&lobrk;":                           true,
+	"&longleftarrow;":                   true,
+	"&longleftrightarrow;":              true,
+	"&longmapsto;":                      true,
+	"&longrightarrow;":                  true,
+	"&looparrowleft;":                   true,
+	"&looparrowright;":                  true,
+	"&lopar;":                           true,
+	"&lopf;":                            true,
+	"&loplus;":                          true,
+	"&lotimes;":                         true,
+	"&lowast;":                          true,
+	"&lowbar;":                          true,
+	"&loz;":                             true,
+	"&lozenge;":                         true,
+	"&lozf;":                            true,
+	"&lpar;":                            true,
+	"&lparlt;":                          true,
+	"&lrarr;":                           true,
+	"&lrcorner;":                        true,
+	"&lrhar;":                           true,
+	"&lrhard;":                          true,
+	"&lrm;":                             true,
+	"&lrtri;":                           true,
+	"&lsaquo;":                          true,
+	"&lscr;":                            true,
+	"&lsh;":                             true,
+	"&lsim;":                            true,
+	"&lsime;":                           true,
+	"&lsimg;":                           true,
+	"&lsqb;":                            true,
+	"&lsquo;":                           true,
+	"&lsquor;":                          true,
+	"&lstrok;":                          true,
+	"&lt":                               true,
+	"&lt;":                              true,
+	"&ltcc;":                            true,
+	"&ltcir;":                           true,
+	"&ltdot;":                           true,
+	"&lthree;":                          true,
+	"&ltimes;":                          true,
+	"&ltlarr;":                          true,
+	"&ltquest;":                         true,
+	"&ltrPar;":                          true,
+	"&ltri;":                            true,
+	"&ltrie;":                           true,
+	"&ltrif;":                           true,
+	"&lurdshar;":                        true,
+	"&luruhar;":                         true,
+	"&lvertneqq;":                       true,
+	"&lvnE;":                            true,
+	"&mDDot;":                           true,
+	"&macr":                             true,
+	"&macr;":                            true,
+	"&male;":                            true,
+	"&malt;":                            true,
+	"&maltese;":                         true,
+	"&map;":                             true,
+	"&mapsto;":                          true,
+	"&mapstodown;":                      true,
+	"&mapstoleft;":                      true,
+	"&mapstoup;":                        true,
+	"&marker;":                          true,
+	"&mcomma;":                          true,
+	"&mcy;":                             true,
+	"&mdash;":                           true,
+	"&measuredangle;":                   true,
+	"&mfr;":                             true,
+	"&mho;":                             true,
+	"&micro":                            true,
+	"&micro;":                           true,
+	"&mid;":                             true,
+	"&midast;":                          true,
+	"&midcir;":                          true,
+	"&middot":                           true,
+	"&middot;":                          true,
+	"&minus;":                           true,
+	"&minusb;":                          true,
+	"&minusd;":                          true,
+	"&minusdu;":                         true,
+	"&mlcp;":                            true,
+	"&mldr;":                            true,
+	"&mnplus;":                          true,
+	"&models;":                          true,
+	"&mopf;":                            true,
+	"&mp;":                              true,
+	"&mscr;":                            true,
+	"&mstpos;":                          true,
+	"&mu;":                              true,
+	"&multimap;":                        true,
+	"&mumap;":                           true,
+	"&nGg;":                             true,
+	"&nGt;":                             true,
+	"&nGtv;":                            true,
+	"&nLeftarrow;":                      true,
+	"&nLeftrightarrow;":                 true,
+	"&nLl;":                             true,
+	"&nLt;":                             true,
+	"&nLtv;":                            true,
+	"&nRightarrow;":                     true,
+	"&nVDash;":                          true,
+	"&nVdash;":                          true,
+	"&nabla;":                           true,
+	"&nacute;":                          true,
+	"&nang;":                            true,
+	"&nap;":                             true,
+	"&napE;":                            true,
+	"&napid;":                           true,
+	"&napos;":                           true,
+	"&napprox;":                         true,
+	"&natur;":                           true,
+	"&natural;":                         true,
+	"&naturals;":                        true,
+	"&nbsp":                             true,
+	"&nbsp;":                            true,
+	"&nbump;":                           true,
+	"&nbumpe;":                          true,
+	"&ncap;":                            true,
+	"&ncaron;":                          true,
+	"&ncedil;":                          true,
+	"&ncong;":                           true,
+	"&ncongdot;":                        true,
+	"&ncup;":                            true,
+	"&ncy;":                             true,
+	"&ndash;":                           true,
+	"&ne;":                              true,
+	"&neArr;":                           true,
+	"&nearhk;":                          true,
+	"&nearr;":                           true,
+	"&nearrow;":                         true,
+	"&nedot;":                           true,
+	"&nequiv;":                          true,
+	"&nesear;":                          true,
+	"&nesim;":                           true,
+	"&nexist;":                          true,
+	"&nexists;":                         true,
+	"&nfr;":                             true,
+	"&ngE;":                             true,
+	"&nge;":                             true,
+	"&ngeq;":                            true,
+	"&ngeqq;":                           true,
+	"&ngeqslant;":                       true,
+	"&nges;":                            true,
+	"&ngsim;":                           true,
+	"&ngt;":                             true,
+	"&ngtr;":                            true,
+	"&nhArr;":                           true,
+	"&nharr;":                           true,
+	"&nhpar;":                           true,
+	"&ni;":                              true,
+	"&nis;":                             true,
+	"&nisd;":                            true,
+	"&niv;":                             true,
+	"&njcy;":                            true,
+	"&nlArr;":                           true,
+	"&nlE;":                             true,
+	"&nlarr;":                           true,
+	"&nldr;":                            true,
+	"&nle;":                             true,
+	"&nleftarrow;":                      true,
+	"&nleftrightarrow;":                 true,
+	"&nleq;":                            true,
+	"&nleqq;":                           true,
+	"&nleqslant;":                       true,
+	"&nles;":                            true,
+	"&nless;":                           true,
+	"&nlsim;":                           true,
+	"&nlt;":                             true,
+	"&nltri;":                           true,
+	"&nltrie;":                          true,
+	"&nmid;":                            true,
+	"&nopf;":                            true,
+	"&not":                              true,
+	"&not;":                             true,
+	"&notin;":                           true,
+	"&notinE;":                          true,
+	"&notindot;":                        true,
+	"&notinva;":                         true,
+	"&notinvb;":                         true,
+	"&notinvc;":                         true,
+	"&notni;":                           true,
+	"&notniva;":                         true,
+	"&notnivb;":                         true,
+	"&notnivc;":                         true,
+	"&npar;":                            true,
+	"&nparallel;":                       true,
+	"&nparsl;":                          true,
+	"&npart;":                           true,
+	"&npolint;":                         true,
+	"&npr;":                             true,
+	"&nprcue;":                          true,
+	"&npre;":                            true,
+	"&nprec;":                           true,
+	"&npreceq;":                         true,
+	"&nrArr;":                           true,
+	"&nrarr;":                           true,
+	"&nrarrc;":                          true,
+	"&nrarrw;":                          true,
+	"&nrightarrow;":                     true,
+	"&nrtri;":                           true,
+	"&nrtrie;":                          true,
+	"&nsc;":                             true,
+	"&nsccue;":                          true,
+	"&nsce;":                            true,
+	"&nscr;":                            true,
+	"&nshortmid;":                       true,
+	"&nshortparallel;":                  true,
+	"&nsim;":                            true,
+	"&nsime;":                           true,
+	"&nsimeq;":                          true,
+	"&nsmid;":                           true,
+	"&nspar;":                           true,
+	"&nsqsube;":                         true,
+	"&nsqsupe;":                         true,
+	"&nsub;":                            true,
+	"&nsubE;":                           true,
+	"&nsube;":                           true,
+	"&nsubset;":                         true,
+	"&nsubseteq;":                       true,
+	"&nsubseteqq;":                      true,
+	"&nsucc;":                           true,
+	"&nsucceq;":                         true,
+	"&nsup;":                            true,
+	"&nsupE;":                           true,
+	"&nsupe;":                           true,
+	"&nsupset;":                         true,
+	"&nsupseteq;":                       true,
+	"&nsupseteqq;":                      true,
+	"&ntgl;":                            true,
+	"&ntilde":                           true,
+	"&ntilde;":                          true,
+	"&ntlg;":                            true,
+	"&ntriangleleft;":                   true,
+	"&ntrianglelefteq;":                 true,
+	"&ntriangleright;":                  true,
+	"&ntrianglerighteq;":                true,
+	"&nu;":                              true,
+	"&num;":                             true,
+	"&numero;":                          true,
+	"&numsp;":                           true,
+	"&nvDash;":                          true,
+	"&nvHarr;":                          true,
+	"&nvap;":                            true,
+	"&nvdash;":                          true,
+	"&nvge;":                            true,
+	"&nvgt;":                            true,
+	"&nvinfin;":                         true,
+	"&nvlArr;":                          true,
+	"&nvle;":                            true,
+	"&nvlt;":                            true,
+	"&nvltrie;":                         true,
+	"&nvrArr;":                          true,
+	"&nvrtrie;":                         true,
+	"&nvsim;":                           true,
+	"&nwArr;":                           true,
+	"&nwarhk;":                          true,
+	"&nwarr;":                           true,
+	"&nwarrow;":                         true,
+	"&nwnear;":                          true,
+	"&oS;":                              true,
+	"&oacute":                           true,
+	"&oacute;":                          true,
+	"&oast;":                            true,
+	"&ocir;":                            true,
+	"&ocirc":                            true,
+	"&ocirc;":                           true,
+	"&ocy;":                             true,
+	"&odash;":                           true,
+	"&odblac;":                          true,
+	"&odiv;":                            true,
+	"&odot;":                            true,
+	"&odsold;":                          true,
+	"&oelig;":                           true,
+	"&ofcir;":                           true,
+	"&ofr;":                             true,
+	"&ogon;":                            true,
+	"&ograve":                           true,
+	"&ograve;":                          true,
+	"&ogt;":                             true,
+	"&ohbar;":                           true,
+	"&ohm;":                             true,
+	"&oint;":                            true,
+	"&olarr;":                           true,
+	"&olcir;":                           true,
+	"&olcross;":                         true,
+	"&oline;":                           true,
+	"&olt;":                             true,
+	"&omacr;":                           true,
+	"&omega;":                           true,
+	"&omicron;":                         true,
+	"&omid;":                            true,
+	"&ominus;":                          true,
+	"&oopf;":                            true,
+	"&opar;":                            true,
+	"&operp;":                           true,
+	"&oplus;":                           true,
+	"&or;":                              true,
+	"&orarr;":                           true,
+	"&ord;":                             true,
+	"&order;":                           true,
+	"&orderof;":                         true,
+	"&ordf":                             true,
+	"&ordf;":                            true,
+	"&ordm":                             true,
+	"&ordm;":                            true,
+	"&origof;":                          true,
+	"&oror;":                            true,
+	"&orslope;":                         true,
+	"&orv;":                             true,
+	"&oscr;":                            true,
+	"&oslash":                           true,
+	"&oslash;":                          true,
+	"&osol;":                            true,
+	"&otilde":                           true,
+	"&otilde;":                          true,
+	"&otimes;":                          true,
+	"&otimesas;":                        true,
+	"&ouml":                             true,
+	"&ouml;":                            true,
+	"&ovbar;":                           true,
+	"&par;":                             true,
+	"&para":                             true,
+	"&para;":                            true,
+	"&parallel;":                        true,
+	"&parsim;":                          true,
+	"&parsl;":                           true,
+	"&part;":                            true,
+	"&pcy;":                             true,
+	"&percnt;":                          true,
+	"&period;":                          true,
+	"&permil;":                          true,
+	"&perp;":                            true,
+	"&pertenk;":                         true,
+	"&pfr;":                             true,
+	"&phi;":                             true,
+	"&phiv;":                            true,
+	"&phmmat;":                          true,
+	"&phone;":                           true,
+	"&pi;":                              true,
+	"&pitchfork;":                       true,
+	"&piv;":                             true,
+	"&planck;":                          true,
+	"&planckh;":                         true,
+	"&plankv;":                          true,
+	"&plus;":                            true,
+	"&plusacir;":                        true,
+	"&plusb;":                           true,
+	"&pluscir;":                         true,
+	"&plusdo;":                          true,
+	"&plusdu;":                          true,
+	"&pluse;":                           true,
+	"&plusmn":                           true,
+	"&plusmn;":                          true,
+	"&plussim;":                         true,
+	"&plustwo;":                         true,
+	"&pm;":                              true,
+	"&pointint;":                        true,
+	"&popf;":                            true,
+	"&pound":                            true,
+	"&pound;":                           true,
+	"&pr;":                              true,
+	"&prE;":                             true,
+	"&prap;":                            true,
+	"&prcue;":                           true,
+	"&pre;":                             true,
+	"&prec;":                            true,
+	"&precapprox;":                      true,
+	"&preccurlyeq;":                     true,
+	"&preceq;":                          true,
+	"&precnapprox;":                     true,
+	"&precneqq;":                        true,
+	"&precnsim;":                        true,
+	"&precsim;":                         true,
+	"&prime;":                           true,
+	"&primes;":                          true,
+	"&prnE;":                            true,
+	"&prnap;":                           true,
+	"&prnsim;":                          true,
+	"&prod;":                            true,
+	"&profalar;":                        true,
+	"&profline;":                        true,
+	"&profsurf;":                        true,
+	"&prop;":                            true,
+	"&propto;":                          true,
+	"&prsim;":                           true,
+	"&prurel;":                          true,
+	"&pscr;":                            true,
+	"&psi;":                             true,
+	"&puncsp;":                          true,
+	"&qfr;":                             true,
+	"&qint;":                            true,
+	"&qopf;":                            true,
+	"&qprime;":                          true,
+	"&qscr;":                            true,
+	"&quaternions;":                     true,
+	"&quatint;":                         true,
+	"&quest;":                           true,
+	"&questeq;":                         true,
+	"&quot":                             true,
+	"&quot;":                            true,
+	"&rAarr;":                           true,
+	"&rArr;":                            true,
+	"&rAtail;":                          true,
+	"&rBarr;":                           true,
+	"&rHar;":                            true,
+	"&race;":                            true,
+	"&racute;":                          true,
+	"&radic;":                           true,
+	"&raemptyv;":                        true,
+	"&rang;":                            true,
+	"&rangd;":                           true,
+	"&range;":                           true,
+	"&rangle;":                          true,
+	"&raquo":                            true,
+	"&raquo;":                           true,
+	"&rarr;":                            true,
+	"&rarrap;":                          true,
+	"&rarrb;":                           true,
+	"&rarrbfs;":                         true,
+	"&rarrc;":                           true,
+	"&rarrfs;":                          true,
+	"&rarrhk;":                          true,
+	"&rarrlp;":                          true,
+	"&rarrpl;":                          true,
+	"&rarrsim;":                         true,
+	"&rarrtl;":                          true,
+	"&rarrw;":                           true,
+	"&ratail;":                          true,
+	"&ratio;":                           true,
+	"&rationals;":                       true,
+	"&rbarr;":                           true,
+	"&rbbrk;":                           true,
+	"&rbrace;":                          true,
+	"&rbrack;":                          true,
+	"&rbrke;":                           true,
+	"&rbrksld;":                         true,
+	"&rbrkslu;":                         true,
+	"&rcaron;":                          true,
+	"&rcedil;":                          true,
+	"&rceil;":                           true,
+	"&rcub;":                            true,
+	"&rcy;":                             true,
+	"&rdca;":                            true,
+	"&rdldhar;":                         true,
+	"&rdquo;":                           true,
+	"&rdquor;":                          true,
+	"&rdsh;":                            true,
+	"&real;":                            true,
+	"&realine;":                         true,
+	"&realpart;":                        true,
+	"&reals;":                           true,
+	"&rect;":                            true,
+	"&reg":                              true,
+	"&reg;":                             true,
+	"&rfisht;":                          true,
+	"&rfloor;":                          true,
+	"&rfr;":                             true,
+	"&rhard;":                           true,
+	"&rharu;":                           true,
+	"&rharul;":                          true,
+	"&rho;":                             true,
+	"&rhov;":                            true,
+	"&rightarrow;":                      true,
+	"&rightarrowtail;":                  true,
+	"&rightharpoondown;":                true,
+	"&rightharpoonup;":                  true,
+	"&rightleftarrows;":                 true,
+	"&rightleftharpoons;":               true,
+	"&rightrightarrows;":                true,
+	"&rightsquigarrow;":                 true,
+	"&rightthreetimes;":                 true,
+	"&ring;":                            true,
+	"&risingdotseq;":                    true,
+	"&rlarr;":                           true,
+	"&rlhar;":                           true,
+	"&rlm;":                             true,
+	"&rmoust;":                          true,
+	"&rmoustache;":                      true,
+	"&rnmid;":                           true,
+	"&roang;":                           true,
+	"&roarr;":                           true,
+	"&robrk;":                           true,
+	"&ropar;":                           true,
+	"&ropf;":                            true,
+	"&roplus;":                          true,
+	"&rotimes;":                         true,
+	"&rpar;":                            true,
+	"&rpargt;":                          true,
+	"&rppolint;":                        true,
+	"&rrarr;":                           true,
+	"&rsaquo;":                          true,
+	"&rscr;":                            true,
+	"&rsh;":                             true,
+	"&rsqb;":                            true,
+	"&rsquo;":                           true,
+	"&rsquor;":                          true,
+	"&rthree;":                          true,
+	"&rtimes;":                          true,
+	"&rtri;":                            true,
+	"&rtrie;":                           true,
+	"&rtrif;":                           true,
+	"&rtriltri;":                        true,
+	"&ruluhar;":                         true,
+	"&rx;":                              true,
+	"&sacute;":                          true,
+	"&sbquo;":                           true,
+	"&sc;":                              true,
+	"&scE;":                             true,
+	"&scap;":                            true,
+	"&scaron;":                          true,
+	"&sccue;":                           true,
+	"&sce;":                             true,
+	"&scedil;":                          true,
+	"&scirc;":                           true,
+	"&scnE;":                            true,
+	"&scnap;":                           true,
+	"&scnsim;":                          true,
+	"&scpolint;":                        true,
+	"&scsim;":                           true,
+	"&scy;":                             true,
+	"&sdot;":                            true,
+	"&sdotb;":                           true,
+	"&sdote;":                           true,
+	"&seArr;":                           true,
+	"&searhk;":                          true,
+	"&searr;":                           true,
+	"&searrow;":                         true,
+	"&sect":                             true,
+	"&sect;":                            true,
+	"&semi;":                            true,
+	"&seswar;":                          true,
+	"&setminus;":                        true,
+	"&setmn;":                           true,
+	"&sext;":                            true,
+	"&sfr;":                             true,
+	"&sfrown;":                          true,
+	"&sharp;":                           true,
+	"&shchcy;":                          true,
+	"&shcy;":                            true,
+	"&shortmid;":                        true,
+	"&shortparallel;":                   true,
+	"&shy":                              true,
+	"&shy;":                             true,
+	"&sigma;":                           true,
+	"&sigmaf;":                          true,
+	"&sigmav;":                          true,
+	"&sim;":                             true,
+	"&simdot;":                          true,
+	"&sime;":                            true,
+	"&simeq;":                           true,
+	"&simg;":                            true,
+	"&simgE;":                           true,
+	"&siml;":                            true,
+	"&simlE;":                           true,
+	"&simne;":                           true,
+	"&simplus;":                         true,
+	"&simrarr;":                         true,
+	"&slarr;":                           true,
+	"&smallsetminus;":                   true,
+	"&smashp;":                          true,
+	"&smeparsl;":                        true,
+	"&smid;":                            true,
+	"&smile;":                           true,
+	"&smt;":                             true,
+	"&smte;":                            true,
+	"&smtes;":                           true,
+	"&softcy;":                          true,
+	"&sol;":                             true,
+	"&solb;":                            true,
+	"&solbar;":                          true,
+	"&sopf;":                            true,
+	"&spades;":                          true,
+	"&spadesuit;":                       true,
+	"&spar;":                            true,
+	"&sqcap;":                           true,
+	"&sqcaps;":                          true,
+	"&sqcup;":                           true,
+	"&sqcups;":                          true,
+	"&sqsub;":                           true,
+	"&sqsube;":                          true,
+	"&sqsubset;":                        true,
+	"&sqsubseteq;":                      true,
+	"&sqsup;":                           true,
+	"&sqsupe;":                          true,
+	"&sqsupset;":                        true,
+	"&sqsupseteq;":                      true,
+	"&squ;":                             true,
+	"&square;":                          true,
+	"&squarf;":                          true,
+	"&squf;":                            true,
+	"&srarr;":                           true,
+	"&sscr;":                            true,
+	"&ssetmn;":                          true,
+	"&ssmile;":                          true,
+	"&sstarf;":                          true,
+	"&star;":                            true,
+	"&starf;":                           true,
+	"&straightepsilon;":                 true,
+	"&straightphi;":                     true,
+	"&strns;":                           true,
+	"&sub;":                             true,
+	"&subE;":                            true,
+	"&subdot;":                          true,
+	"&sube;":                            true,
+	"&subedot;":                         true,
+	"&submult;":                         true,
+	"&subnE;":                           true,
+	"&subne;":                           true,
+	"&subplus;":                         true,
+	"&subrarr;":                         true,
+	"&subset;":                          true,
+	"&subseteq;":                        true,
+	"&subseteqq;":                       true,
+	"&subsetneq;":                       true,
+	"&subsetneqq;":                      true,
+	"&subsim;":                          true,
+	"&subsub;":                          true,
+	"&subsup;":                          true,
+	"&succ;":                            true,
+	"&succapprox;":                      true,
+	"&succcurlyeq;":                     true,
+	"&succeq;":                          true,
+	"&succnapprox;":                     true,
+	"&succneqq;":                        true,
+	"&succnsim;":                        true,
+	"&succsim;":                         true,
+	"&sum;":                             true,
+	"&sung;":                            true,
+	"&sup1":                             true,
+	"&sup1;":                            true,
+	"&sup2":                             true,
+	"&sup2;":                            true,
+	"&sup3":                             true,
+	"&sup3;":                            true,
+	"&sup;":                             true,
+	"&supE;":                            true,
+	"&supdot;":                          true,
+	"&supdsub;":                         true,
+	"&supe;":                            true,
+	"&supedot;":                         true,
+	"&suphsol;":                         true,
+	"&suphsub;":                         true,
+	"&suplarr;":                         true,
+	"&supmult;":                         true,
+	"&supnE;":                           true,
+	"&supne;":                           true,
+	"&supplus;":                         true,
+	"&supset;":                          true,
+	"&supseteq;":                        true,
+	"&supseteqq;":                       true,
+	"&supsetneq;":                       true,
+	"&supsetneqq;":                      true,
+	"&supsim;":                          true,
+	"&supsub;":                          true,
+	"&supsup;":                          true,
+	"&swArr;":                           true,
+	"&swarhk;":                          true,
+	"&swarr;":                           true,
+	"&swarrow;":                         true,
+	"&swnwar;":                          true,
+	"&szlig":                            true,
+	"&szlig;":                           true,
+	"&target;":                          true,
+	"&tau;":                             true,
+	"&tbrk;":                            true,
+	"&tcaron;":                          true,
+	"&tcedil;":                          true,
+	"&tcy;":                             true,
+	"&tdot;":                            true,
+	"&telrec;":                          true,
+	"&tfr;":                             true,
+	"&there4;":                          true,
+	"&therefore;":                       true,
+	"&theta;":                           true,
+	"&thetasym;":                        true,
+	"&thetav;":                          true,
+	"&thickapprox;":                     true,
+	"&thicksim;":                        true,
+	"&thinsp;":                          true,
+	"&thkap;":                           true,
+	"&thksim;":                          true,
+	"&thorn":                            true,
+	"&thorn;":                           true,
+	"&tilde;":                           true,
+	"&times":                            true,
+	"&times;":                           true,
+	"&timesb;":                          true,
+	"&timesbar;":                        true,
+	"&timesd;":                          true,
+	"&tint;":                            true,
+	"&toea;":                            true,
+	"&top;":                             true,
+	"&topbot;":                          true,
+	"&topcir;":                          true,
+	"&topf;":                            true,
+	"&topfork;":                         true,
+	"&tosa;":                            true,
+	"&tprime;":                          true,
+	"&trade;":                           true,
+	"&triangle;":                        true,
+	"&triangledown;":                    true,
+	"&triangleleft;":                    true,
+	"&trianglelefteq;":                  true,
+	"&triangleq;":                       true,
+	"&triangleright;":                   true,
+	"&trianglerighteq;":                 true,
+	"&tridot;":                          true,
+	"&trie;":                            true,
+	"&triminus;":                        true,
+	"&triplus;":                         true,
+	"&trisb;":                           true,
+	"&tritime;":                         true,
+	"&trpezium;":                        true,
+	"&tscr;":                            true,
+	"&tscy;":                            true,
+	"&tshcy;":                           true,
+	"&tstrok;":                          true,
+	"&twixt;":                           true,
+	"&twoheadleftarrow;":                true,
+	"&twoheadrightarrow;":               true,
+	"&uArr;":                            true,
+	"&uHar;":                            true,
+	"&uacute":                           true,
+	"&uacute;":                          true,
+	"&uarr;":                            true,
+	"&ubrcy;":                           true,
+	"&ubreve;":                          true,
+	"&ucirc":                            true,
+	"&ucirc;":                           true,
+	"&ucy;":                             true,
+	"&udarr;":                           true,
+	"&udblac;":                          true,
+	"&udhar;":                           true,
+	"&ufisht;":                          true,
+	"&ufr;":                             true,
+	"&ugrave":                           true,
+	"&ugrave;":                          true,
+	"&uharl;":                           true,
+	"&uharr;":                           true,
+	"&uhblk;":                           true,
+	"&ulcorn;":                          true,
+	"&ulcorner;":                        true,
+	"&ulcrop;":                          true,
+	"&ultri;":                           true,
+	"&umacr;":                           true,
+	"&uml":                              true,
+	"&uml;":                             true,
+	"&uogon;":                           true,
+	"&uopf;":                            true,
+	"&uparrow;":                         true,
+	"&updownarrow;":                     true,
+	"&upharpoonleft;":                   true,
+	"&upharpoonright;":                  true,
+	"&uplus;":                           true,
+	"&upsi;":                            true,
+	"&upsih;":                           true,
+	"&upsilon;":                         true,
+	"&upuparrows;":                      true,
+	"&urcorn;":                          true,
+	"&urcorner;":                        true,
+	"&urcrop;":                          true,
+	"&uring;":                           true,
+	"&urtri;":                           true,
+	"&uscr;":                            true,
+	"&utdot;":                           true,
+	"&utilde;":                          true,
+	"&utri;":                            true,
+	"&utrif;":                           true,
+	"&uuarr;":                           true,
+	"&uuml":                             true,
+	"&uuml;":                            true,
+	"&uwangle;":                         true,
+	"&vArr;":                            true,
+	"&vBar;":                            true,
+	"&vBarv;":                           true,
+	"&vDash;":                           true,
+	"&vangrt;":                          true,
+	"&varepsilon;":                      true,
+	"&varkappa;":                        true,
+	"&varnothing;":                      true,
+	"&varphi;":                          true,
+	"&varpi;":                           true,
+	"&varpropto;":                       true,
+	"&varr;":                            true,
+	"&varrho;":                          true,
+	"&varsigma;":                        true,
+	"&varsubsetneq;":                    true,
+	"&varsubsetneqq;":                   true,
+	"&varsupsetneq;":                    true,
+	"&varsupsetneqq;":                   true,
+	"&vartheta;":                        true,
+	"&vartriangleleft;":                 true,
+	"&vartriangleright;":                true,
+	"&vcy;":                             true,
+	"&vdash;":                           true,
+	"&vee;":                             true,
+	"&veebar;":                          true,
+	"&veeeq;":                           true,
+	"&vellip;":                          true,
+	"&verbar;":                          true,
+	"&vert;":                            true,
+	"&vfr;":                             true,
+	"&vltri;":                           true,
+	"&vnsub;":                           true,
+	"&vnsup;":                           true,
+	"&vopf;":                            true,
+	"&vprop;":                           true,
+	"&vrtri;":                           true,
+	"&vscr;":                            true,
+	"&vsubnE;":                          true,
+	"&vsubne;":                          true,
+	"&vsupnE;":                          true,
+	"&vsupne;":                          true,
+	"&vzigzag;":                         true,
+	"&wcirc;":                           true,
+	"&wedbar;":                          true,
+	"&wedge;":                           true,
+	"&wedgeq;":                          true,
+	"&weierp;":                          true,
+	"&wfr;":                             true,
+	"&wopf;":                            true,
+	"&wp;":                              true,
+	"&wr;":                              true,
+	"&wreath;":                          true,
+	"&wscr;":                            true,
+	"&xcap;":                            true,
+	"&xcirc;":                           true,
+	"&xcup;":                            true,
+	"&xdtri;":                           true,
+	"&xfr;":                             true,
+	"&xhArr;":                           true,
+	"&xharr;":                           true,
+	"&xi;":                              true,
+	"&xlArr;":                           true,
+	"&xlarr;":                           true,
+	"&xmap;":                            true,
+	"&xnis;":                            true,
+	"&xodot;":                           true,
+	"&xopf;":                            true,
+	"&xoplus;":                          true,
+	"&xotime;":                          true,
+	"&xrArr;":                           true,
+	"&xrarr;":                           true,
+	"&xscr;":                            true,
+	"&xsqcup;":                          true,
+	"&xuplus;":                          true,
+	"&xutri;":                           true,
+	"&xvee;":                            true,
+	"&xwedge;":                          true,
+	"&yacute":                           true,
+	"&yacute;":                          true,
+	"&yacy;":                            true,
+	"&ycirc;":                           true,
+	"&ycy;":                             true,
+	"&yen":                              true,
+	"&yen;":                             true,
+	"&yfr;":                             true,
+	"&yicy;":                            true,
+	"&yopf;":                            true,
+	"&yscr;":                            true,
+	"&yucy;":                            true,
+	"&yuml":                             true,
+	"&yuml;":                            true,
+	"&zacute;":                          true,
+	"&zcaron;":                          true,
+	"&zcy;":                             true,
+	"&zdot;":                            true,
+	"&zeetrf;":                          true,
+	"&zeta;":                            true,
+	"&zfr;":                             true,
+	"&zhcy;":                            true,
+	"&zigrarr;":                         true,
+	"&zopf;":                            true,
+	"&zscr;":                            true,
+	"&zwj;":                             true,
+	"&zwnj;":                            true,
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/esc.go b/test/tools/vendor/github.com/russross/blackfriday/v2/esc.go
new file mode 100644
index 000000000..6ab60102c
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/esc.go
@@ -0,0 +1,70 @@
+package blackfriday
+
+import (
+	"html"
+	"io"
+)
+
+var htmlEscaper = [256][]byte{
+	'&': []byte("&amp;"),
+	'<': []byte("&lt;"),
+	'>': []byte("&gt;"),
+	'"': []byte("&quot;"),
+}
+
+func escapeHTML(w io.Writer, s []byte) {
+	escapeEntities(w, s, false)
+}
+
+func escapeAllHTML(w io.Writer, s []byte) {
+	escapeEntities(w, s, true)
+}
+
+func escapeEntities(w io.Writer, s []byte, escapeValidEntities bool) {
+	var start, end int
+	for end < len(s) {
+		escSeq := htmlEscaper[s[end]]
+		if escSeq != nil {
+			isEntity, entityEnd := nodeIsEntity(s, end)
+			if isEntity && !escapeValidEntities {
+				w.Write(s[start : entityEnd+1])
+				start = entityEnd + 1
+			} else {
+				w.Write(s[start:end])
+				w.Write(escSeq)
+				start = end + 1
+			}
+		}
+		end++
+	}
+	if start < len(s) && end <= len(s) {
+		w.Write(s[start:end])
+	}
+}
+
+func nodeIsEntity(s []byte, end int) (isEntity bool, endEntityPos int) {
+	isEntity = false
+	endEntityPos = end + 1
+
+	if s[end] == '&' {
+		for endEntityPos < len(s) {
+			if s[endEntityPos] == ';' {
+				if entities[string(s[end:endEntityPos+1])] {
+					isEntity = true
+					break
+				}
+			}
+			if !isalnum(s[endEntityPos]) && s[endEntityPos] != '&' && s[endEntityPos] != '#' {
+				break
+			}
+			endEntityPos++
+		}
+	}
+
+	return isEntity, endEntityPos
+}
+
+func escLink(w io.Writer, text []byte) {
+	unesc := html.UnescapeString(string(text))
+	escapeHTML(w, []byte(unesc))
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/go.mod b/test/tools/vendor/github.com/russross/blackfriday/v2/go.mod
new file mode 100644
index 000000000..620b74e0a
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/go.mod
@@ -0,0 +1 @@
+module github.com/russross/blackfriday/v2
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/html.go b/test/tools/vendor/github.com/russross/blackfriday/v2/html.go
new file mode 100644
index 000000000..cb4f26e30
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/html.go
@@ -0,0 +1,952 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+//
+// HTML rendering backend
+//
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"regexp"
+	"strings"
+)
+
+// HTMLFlags control optional behavior of HTML renderer.
+type HTMLFlags int
+
+// HTML renderer configuration options.
+const (
+	HTMLFlagsNone           HTMLFlags = 0
+	SkipHTML                HTMLFlags = 1 << iota // Skip preformatted HTML blocks
+	SkipImages                                    // Skip embedded images
+	SkipLinks                                     // Skip all links
+	Safelink                                      // Only link to trusted protocols
+	NofollowLinks                                 // Only link with rel="nofollow"
+	NoreferrerLinks                               // Only link with rel="noreferrer"
+	NoopenerLinks                                 // Only link with rel="noopener"
+	HrefTargetBlank                               // Add a blank target
+	CompletePage                                  // Generate a complete HTML page
+	UseXHTML                                      // Generate XHTML output instead of HTML
+	FootnoteReturnLinks                           // Generate a link at the end of a footnote to return to the source
+	Smartypants                                   // Enable smart punctuation substitutions
+	SmartypantsFractions                          // Enable smart fractions (with Smartypants)
+	SmartypantsDashes                             // Enable smart dashes (with Smartypants)
+	SmartypantsLatexDashes                        // Enable LaTeX-style dashes (with Smartypants)
+	SmartypantsAngledQuotes                       // Enable angled double quotes (with Smartypants) for double quotes rendering
+	SmartypantsQuotesNBSP                         // Enable « French guillemets » (with Smartypants)
+	TOC                                           // Generate a table of contents
+)
+
+var (
+	htmlTagRe = regexp.MustCompile("(?i)^" + htmlTag)
+)
+
+const (
+	htmlTag = "(?:" + openTag + "|" + closeTag + "|" + htmlComment + "|" +
+		processingInstruction + "|" + declaration + "|" + cdata + ")"
+	closeTag              = "</" + tagName + "\\s*[>]"
+	openTag               = "<" + tagName + attribute + "*" + "\\s*/?>"
+	attribute             = "(?:" + "\\s+" + attributeName + attributeValueSpec + "?)"
+	attributeValue        = "(?:" + unquotedValue + "|" + singleQuotedValue + "|" + doubleQuotedValue + ")"
+	attributeValueSpec    = "(?:" + "\\s*=" + "\\s*" + attributeValue + ")"
+	attributeName         = "[a-zA-Z_:][a-zA-Z0-9:._-]*"
+	cdata                 = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>"
+	declaration           = "<![A-Z]+" + "\\s+[^>]*>"
+	doubleQuotedValue     = "\"[^\"]*\""
+	htmlComment           = "<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->"
+	processingInstruction = "[<][?].*?[?][>]"
+	singleQuotedValue     = "'[^']*'"
+	tagName               = "[A-Za-z][A-Za-z0-9-]*"
+	unquotedValue         = "[^\"'=<>`\\x00-\\x20]+"
+)
+
+// HTMLRendererParameters is a collection of supplementary parameters tweaking
+// the behavior of various parts of HTML renderer.
+type HTMLRendererParameters struct {
+	// Prepend this text to each relative URL.
+	AbsolutePrefix string
+	// Add this text to each footnote anchor, to ensure uniqueness.
+	FootnoteAnchorPrefix string
+	// Show this text inside the <a> tag for a footnote return link, if the
+	// HTML_FOOTNOTE_RETURN_LINKS flag is enabled. If blank, the string
+	// <sup>[return]</sup> is used.
+	FootnoteReturnLinkContents string
+	// If set, add this text to the front of each Heading ID, to ensure
+	// uniqueness.
+	HeadingIDPrefix string
+	// If set, add this text to the back of each Heading ID, to ensure uniqueness.
+	HeadingIDSuffix string
+	// Increase heading levels: if the offset is 1, <h1> becomes <h2> etc.
+	// Negative offset is also valid.
+	// Resulting levels are clipped between 1 and 6.
+	HeadingLevelOffset int
+
+	Title string // Document title (used if CompletePage is set)
+	CSS   string // Optional CSS file URL (used if CompletePage is set)
+	Icon  string // Optional icon file URL (used if CompletePage is set)
+
+	Flags HTMLFlags // Flags allow customizing this renderer's behavior
+}
+
+// HTMLRenderer is a type that implements the Renderer interface for HTML output.
+//
+// Do not create this directly, instead use the NewHTMLRenderer function.
+type HTMLRenderer struct {
+	HTMLRendererParameters
+
+	closeTag string // how to end singleton tags: either " />" or ">"
+
+	// Track heading IDs to prevent ID collision in a single generation.
+	headingIDs map[string]int
+
+	lastOutputLen int
+	disableTags   int
+
+	sr *SPRenderer
+}
+
+const (
+	xhtmlClose = " />"
+	htmlClose  = ">"
+)
+
+// NewHTMLRenderer creates and configures an HTMLRenderer object, which
+// satisfies the Renderer interface.
+func NewHTMLRenderer(params HTMLRendererParameters) *HTMLRenderer {
+	// configure the rendering engine
+	closeTag := htmlClose
+	if params.Flags&UseXHTML != 0 {
+		closeTag = xhtmlClose
+	}
+
+	if params.FootnoteReturnLinkContents == "" {
+		// U+FE0E is VARIATION SELECTOR-15.
+		// It suppresses automatic emoji presentation of the preceding
+		// U+21A9 LEFTWARDS ARROW WITH HOOK on iOS and iPadOS.
+		params.FootnoteReturnLinkContents = "<span aria-label='Return'>↩\ufe0e</span>"
+	}
+
+	return &HTMLRenderer{
+		HTMLRendererParameters: params,
+
+		closeTag:   closeTag,
+		headingIDs: make(map[string]int),
+
+		sr: NewSmartypantsRenderer(params.Flags),
+	}
+}
+
+func isHTMLTag(tag []byte, tagname string) bool {
+	found, _ := findHTMLTagPos(tag, tagname)
+	return found
+}
+
+// Look for a character, but ignore it when it's in any kind of quotes, it
+// might be JavaScript
+func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int {
+	inSingleQuote := false
+	inDoubleQuote := false
+	inGraveQuote := false
+	i := start
+	for i < len(html) {
+		switch {
+		case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote:
+			return i
+		case html[i] == '\'':
+			inSingleQuote = !inSingleQuote
+		case html[i] == '"':
+			inDoubleQuote = !inDoubleQuote
+		case html[i] == '`':
+			inGraveQuote = !inGraveQuote
+		}
+		i++
+	}
+	return start
+}
+
+func findHTMLTagPos(tag []byte, tagname string) (bool, int) {
+	i := 0
+	if i < len(tag) && tag[0] != '<' {
+		return false, -1
+	}
+	i++
+	i = skipSpace(tag, i)
+
+	if i < len(tag) && tag[i] == '/' {
+		i++
+	}
+
+	i = skipSpace(tag, i)
+	j := 0
+	for ; i < len(tag); i, j = i+1, j+1 {
+		if j >= len(tagname) {
+			break
+		}
+
+		if strings.ToLower(string(tag[i]))[0] != tagname[j] {
+			return false, -1
+		}
+	}
+
+	if i == len(tag) {
+		return false, -1
+	}
+
+	rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>')
+	if rightAngle >= i {
+		return true, rightAngle
+	}
+
+	return false, -1
+}
+
+func skipSpace(tag []byte, i int) int {
+	for i < len(tag) && isspace(tag[i]) {
+		i++
+	}
+	return i
+}
+
+func isRelativeLink(link []byte) (yes bool) {
+	// a tag begin with '#'
+	if link[0] == '#' {
+		return true
+	}
+
+	// link begin with '/' but not '//', the second maybe a protocol relative link
+	if len(link) >= 2 && link[0] == '/' && link[1] != '/' {
+		return true
+	}
+
+	// only the root '/'
+	if len(link) == 1 && link[0] == '/' {
+		return true
+	}
+
+	// current directory : begin with "./"
+	if bytes.HasPrefix(link, []byte("./")) {
+		return true
+	}
+
+	// parent directory : begin with "../"
+	if bytes.HasPrefix(link, []byte("../")) {
+		return true
+	}
+
+	return false
+}
+
+func (r *HTMLRenderer) ensureUniqueHeadingID(id string) string {
+	for count, found := r.headingIDs[id]; found; count, found = r.headingIDs[id] {
+		tmp := fmt.Sprintf("%s-%d", id, count+1)
+
+		if _, tmpFound := r.headingIDs[tmp]; !tmpFound {
+			r.headingIDs[id] = count + 1
+			id = tmp
+		} else {
+			id = id + "-1"
+		}
+	}
+
+	if _, found := r.headingIDs[id]; !found {
+		r.headingIDs[id] = 0
+	}
+
+	return id
+}
+
+func (r *HTMLRenderer) addAbsPrefix(link []byte) []byte {
+	if r.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' {
+		newDest := r.AbsolutePrefix
+		if link[0] != '/' {
+			newDest += "/"
+		}
+		newDest += string(link)
+		return []byte(newDest)
+	}
+	return link
+}
+
+func appendLinkAttrs(attrs []string, flags HTMLFlags, link []byte) []string {
+	if isRelativeLink(link) {
+		return attrs
+	}
+	val := []string{}
+	if flags&NofollowLinks != 0 {
+		val = append(val, "nofollow")
+	}
+	if flags&NoreferrerLinks != 0 {
+		val = append(val, "noreferrer")
+	}
+	if flags&NoopenerLinks != 0 {
+		val = append(val, "noopener")
+	}
+	if flags&HrefTargetBlank != 0 {
+		attrs = append(attrs, "target=\"_blank\"")
+	}
+	if len(val) == 0 {
+		return attrs
+	}
+	attr := fmt.Sprintf("rel=%q", strings.Join(val, " "))
+	return append(attrs, attr)
+}
+
+func isMailto(link []byte) bool {
+	return bytes.HasPrefix(link, []byte("mailto:"))
+}
+
+func needSkipLink(flags HTMLFlags, dest []byte) bool {
+	if flags&SkipLinks != 0 {
+		return true
+	}
+	return flags&Safelink != 0 && !isSafeLink(dest) && !isMailto(dest)
+}
+
+func isSmartypantable(node *Node) bool {
+	pt := node.Parent.Type
+	return pt != Link && pt != CodeBlock && pt != Code
+}
+
+func appendLanguageAttr(attrs []string, info []byte) []string {
+	if len(info) == 0 {
+		return attrs
+	}
+	endOfLang := bytes.IndexAny(info, "\t ")
+	if endOfLang < 0 {
+		endOfLang = len(info)
+	}
+	return append(attrs, fmt.Sprintf("class=\"language-%s\"", info[:endOfLang]))
+}
+
+func (r *HTMLRenderer) tag(w io.Writer, name []byte, attrs []string) {
+	w.Write(name)
+	if len(attrs) > 0 {
+		w.Write(spaceBytes)
+		w.Write([]byte(strings.Join(attrs, " ")))
+	}
+	w.Write(gtBytes)
+	r.lastOutputLen = 1
+}
+
+func footnoteRef(prefix string, node *Node) []byte {
+	urlFrag := prefix + string(slugify(node.Destination))
+	anchor := fmt.Sprintf(`<a href="#fn:%s">%d</a>`, urlFrag, node.NoteID)
+	return []byte(fmt.Sprintf(`<sup class="footnote-ref" id="fnref:%s">%s</sup>`, urlFrag, anchor))
+}
+
+func footnoteItem(prefix string, slug []byte) []byte {
+	return []byte(fmt.Sprintf(`<li id="fn:%s%s">`, prefix, slug))
+}
+
+func footnoteReturnLink(prefix, returnLink string, slug []byte) []byte {
+	const format = ` <a class="footnote-return" href="#fnref:%s%s">%s</a>`
+	return []byte(fmt.Sprintf(format, prefix, slug, returnLink))
+}
+
+func itemOpenCR(node *Node) bool {
+	if node.Prev == nil {
+		return false
+	}
+	ld := node.Parent.ListData
+	return !ld.Tight && ld.ListFlags&ListTypeDefinition == 0
+}
+
+func skipParagraphTags(node *Node) bool {
+	grandparent := node.Parent.Parent
+	if grandparent == nil || grandparent.Type != List {
+		return false
+	}
+	tightOrTerm := grandparent.Tight || node.Parent.ListFlags&ListTypeTerm != 0
+	return grandparent.Type == List && tightOrTerm
+}
+
+func cellAlignment(align CellAlignFlags) string {
+	switch align {
+	case TableAlignmentLeft:
+		return "left"
+	case TableAlignmentRight:
+		return "right"
+	case TableAlignmentCenter:
+		return "center"
+	default:
+		return ""
+	}
+}
+
+func (r *HTMLRenderer) out(w io.Writer, text []byte) {
+	if r.disableTags > 0 {
+		w.Write(htmlTagRe.ReplaceAll(text, []byte{}))
+	} else {
+		w.Write(text)
+	}
+	r.lastOutputLen = len(text)
+}
+
+func (r *HTMLRenderer) cr(w io.Writer) {
+	if r.lastOutputLen > 0 {
+		r.out(w, nlBytes)
+	}
+}
+
+var (
+	nlBytes    = []byte{'\n'}
+	gtBytes    = []byte{'>'}
+	spaceBytes = []byte{' '}
+)
+
+var (
+	brTag              = []byte("<br>")
+	brXHTMLTag         = []byte("<br />")
+	emTag              = []byte("<em>")
+	emCloseTag         = []byte("</em>")
+	strongTag          = []byte("<strong>")
+	strongCloseTag     = []byte("</strong>")
+	delTag             = []byte("<del>")
+	delCloseTag        = []byte("</del>")
+	ttTag              = []byte("<tt>")
+	ttCloseTag         = []byte("</tt>")
+	aTag               = []byte("<a")
+	aCloseTag          = []byte("</a>")
+	preTag             = []byte("<pre>")
+	preCloseTag        = []byte("</pre>")
+	codeTag            = []byte("<code>")
+	codeCloseTag       = []byte("</code>")
+	pTag               = []byte("<p>")
+	pCloseTag          = []byte("</p>")
+	blockquoteTag      = []byte("<blockquote>")
+	blockquoteCloseTag = []byte("</blockquote>")
+	hrTag              = []byte("<hr>")
+	hrXHTMLTag         = []byte("<hr />")
+	ulTag              = []byte("<ul>")
+	ulCloseTag         = []byte("</ul>")
+	olTag              = []byte("<ol>")
+	olCloseTag         = []byte("</ol>")
+	dlTag              = []byte("<dl>")
+	dlCloseTag         = []byte("</dl>")
+	liTag              = []byte("<li>")
+	liCloseTag         = []byte("</li>")
+	ddTag              = []byte("<dd>")
+	ddCloseTag         = []byte("</dd>")
+	dtTag              = []byte("<dt>")
+	dtCloseTag         = []byte("</dt>")
+	tableTag           = []byte("<table>")
+	tableCloseTag      = []byte("</table>")
+	tdTag              = []byte("<td")
+	tdCloseTag         = []byte("</td>")
+	thTag              = []byte("<th")
+	thCloseTag         = []byte("</th>")
+	theadTag           = []byte("<thead>")
+	theadCloseTag      = []byte("</thead>")
+	tbodyTag           = []byte("<tbody>")
+	tbodyCloseTag      = []byte("</tbody>")
+	trTag              = []byte("<tr>")
+	trCloseTag         = []byte("</tr>")
+	h1Tag              = []byte("<h1")
+	h1CloseTag         = []byte("</h1>")
+	h2Tag              = []byte("<h2")
+	h2CloseTag         = []byte("</h2>")
+	h3Tag              = []byte("<h3")
+	h3CloseTag         = []byte("</h3>")
+	h4Tag              = []byte("<h4")
+	h4CloseTag         = []byte("</h4>")
+	h5Tag              = []byte("<h5")
+	h5CloseTag         = []byte("</h5>")
+	h6Tag              = []byte("<h6")
+	h6CloseTag         = []byte("</h6>")
+
+	footnotesDivBytes      = []byte("\n<div class=\"footnotes\">\n\n")
+	footnotesCloseDivBytes = []byte("\n</div>\n")
+)
+
+func headingTagsFromLevel(level int) ([]byte, []byte) {
+	if level <= 1 {
+		return h1Tag, h1CloseTag
+	}
+	switch level {
+	case 2:
+		return h2Tag, h2CloseTag
+	case 3:
+		return h3Tag, h3CloseTag
+	case 4:
+		return h4Tag, h4CloseTag
+	case 5:
+		return h5Tag, h5CloseTag
+	}
+	return h6Tag, h6CloseTag
+}
+
+func (r *HTMLRenderer) outHRTag(w io.Writer) {
+	if r.Flags&UseXHTML == 0 {
+		r.out(w, hrTag)
+	} else {
+		r.out(w, hrXHTMLTag)
+	}
+}
+
+// RenderNode is a default renderer of a single node of a syntax tree. For
+// block nodes it will be called twice: first time with entering=true, second
+// time with entering=false, so that it could know when it's working on an open
+// tag and when on close. It writes the result to w.
+//
+// The return value is a way to tell the calling walker to adjust its walk
+// pattern: e.g. it can terminate the traversal by returning Terminate. Or it
+// can ask the walker to skip a subtree of this node by returning SkipChildren.
+// The typical behavior is to return GoToNext, which asks for the usual
+// traversal to the next node.
+func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkStatus {
+	attrs := []string{}
+	switch node.Type {
+	case Text:
+		if r.Flags&Smartypants != 0 {
+			var tmp bytes.Buffer
+			escapeHTML(&tmp, node.Literal)
+			r.sr.Process(w, tmp.Bytes())
+		} else {
+			if node.Parent.Type == Link {
+				escLink(w, node.Literal)
+			} else {
+				escapeHTML(w, node.Literal)
+			}
+		}
+	case Softbreak:
+		r.cr(w)
+		// TODO: make it configurable via out(renderer.softbreak)
+	case Hardbreak:
+		if r.Flags&UseXHTML == 0 {
+			r.out(w, brTag)
+		} else {
+			r.out(w, brXHTMLTag)
+		}
+		r.cr(w)
+	case Emph:
+		if entering {
+			r.out(w, emTag)
+		} else {
+			r.out(w, emCloseTag)
+		}
+	case Strong:
+		if entering {
+			r.out(w, strongTag)
+		} else {
+			r.out(w, strongCloseTag)
+		}
+	case Del:
+		if entering {
+			r.out(w, delTag)
+		} else {
+			r.out(w, delCloseTag)
+		}
+	case HTMLSpan:
+		if r.Flags&SkipHTML != 0 {
+			break
+		}
+		r.out(w, node.Literal)
+	case Link:
+		// mark it but don't link it if it is not a safe link: no smartypants
+		dest := node.LinkData.Destination
+		if needSkipLink(r.Flags, dest) {
+			if entering {
+				r.out(w, ttTag)
+			} else {
+				r.out(w, ttCloseTag)
+			}
+		} else {
+			if entering {
+				dest = r.addAbsPrefix(dest)
+				var hrefBuf bytes.Buffer
+				hrefBuf.WriteString("href=\"")
+				escLink(&hrefBuf, dest)
+				hrefBuf.WriteByte('"')
+				attrs = append(attrs, hrefBuf.String())
+				if node.NoteID != 0 {
+					r.out(w, footnoteRef(r.FootnoteAnchorPrefix, node))
+					break
+				}
+				attrs = appendLinkAttrs(attrs, r.Flags, dest)
+				if len(node.LinkData.Title) > 0 {
+					var titleBuff bytes.Buffer
+					titleBuff.WriteString("title=\"")
+					escapeHTML(&titleBuff, node.LinkData.Title)
+					titleBuff.WriteByte('"')
+					attrs = append(attrs, titleBuff.String())
+				}
+				r.tag(w, aTag, attrs)
+			} else {
+				if node.NoteID != 0 {
+					break
+				}
+				r.out(w, aCloseTag)
+			}
+		}
+	case Image:
+		if r.Flags&SkipImages != 0 {
+			return SkipChildren
+		}
+		if entering {
+			dest := node.LinkData.Destination
+			dest = r.addAbsPrefix(dest)
+			if r.disableTags == 0 {
+				//if options.safe && potentiallyUnsafe(dest) {
+				//out(w, `<img src="" alt="`)
+				//} else {
+				r.out(w, []byte(`<img src="`))
+				escLink(w, dest)
+				r.out(w, []byte(`" alt="`))
+				//}
+			}
+			r.disableTags++
+		} else {
+			r.disableTags--
+			if r.disableTags == 0 {
+				if node.LinkData.Title != nil {
+					r.out(w, []byte(`" title="`))
+					escapeHTML(w, node.LinkData.Title)
+				}
+				r.out(w, []byte(`" />`))
+			}
+		}
+	case Code:
+		r.out(w, codeTag)
+		escapeAllHTML(w, node.Literal)
+		r.out(w, codeCloseTag)
+	case Document:
+		break
+	case Paragraph:
+		if skipParagraphTags(node) {
+			break
+		}
+		if entering {
+			// TODO: untangle this clusterfuck about when the newlines need
+			// to be added and when not.
+			if node.Prev != nil {
+				switch node.Prev.Type {
+				case HTMLBlock, List, Paragraph, Heading, CodeBlock, BlockQuote, HorizontalRule:
+					r.cr(w)
+				}
+			}
+			if node.Parent.Type == BlockQuote && node.Prev == nil {
+				r.cr(w)
+			}
+			r.out(w, pTag)
+		} else {
+			r.out(w, pCloseTag)
+			if !(node.Parent.Type == Item && node.Next == nil) {
+				r.cr(w)
+			}
+		}
+	case BlockQuote:
+		if entering {
+			r.cr(w)
+			r.out(w, blockquoteTag)
+		} else {
+			r.out(w, blockquoteCloseTag)
+			r.cr(w)
+		}
+	case HTMLBlock:
+		if r.Flags&SkipHTML != 0 {
+			break
+		}
+		r.cr(w)
+		r.out(w, node.Literal)
+		r.cr(w)
+	case Heading:
+		headingLevel := r.HTMLRendererParameters.HeadingLevelOffset + node.Level
+		openTag, closeTag := headingTagsFromLevel(headingLevel)
+		if entering {
+			if node.IsTitleblock {
+				attrs = append(attrs, `class="title"`)
+			}
+			if node.HeadingID != "" {
+				id := r.ensureUniqueHeadingID(node.HeadingID)
+				if r.HeadingIDPrefix != "" {
+					id = r.HeadingIDPrefix + id
+				}
+				if r.HeadingIDSuffix != "" {
+					id = id + r.HeadingIDSuffix
+				}
+				attrs = append(attrs, fmt.Sprintf(`id="%s"`, id))
+			}
+			r.cr(w)
+			r.tag(w, openTag, attrs)
+		} else {
+			r.out(w, closeTag)
+			if !(node.Parent.Type == Item && node.Next == nil) {
+				r.cr(w)
+			}
+		}
+	case HorizontalRule:
+		r.cr(w)
+		r.outHRTag(w)
+		r.cr(w)
+	case List:
+		openTag := ulTag
+		closeTag := ulCloseTag
+		if node.ListFlags&ListTypeOrdered != 0 {
+			openTag = olTag
+			closeTag = olCloseTag
+		}
+		if node.ListFlags&ListTypeDefinition != 0 {
+			openTag = dlTag
+			closeTag = dlCloseTag
+		}
+		if entering {
+			if node.IsFootnotesList {
+				r.out(w, footnotesDivBytes)
+				r.outHRTag(w)
+				r.cr(w)
+			}
+			r.cr(w)
+			if node.Parent.Type == Item && node.Parent.Parent.Tight {
+				r.cr(w)
+			}
+			r.tag(w, openTag[:len(openTag)-1], attrs)
+			r.cr(w)
+		} else {
+			r.out(w, closeTag)
+			//cr(w)
+			//if node.parent.Type != Item {
+			//	cr(w)
+			//}
+			if node.Parent.Type == Item && node.Next != nil {
+				r.cr(w)
+			}
+			if node.Parent.Type == Document || node.Parent.Type == BlockQuote {
+				r.cr(w)
+			}
+			if node.IsFootnotesList {
+				r.out(w, footnotesCloseDivBytes)
+			}
+		}
+	case Item:
+		openTag := liTag
+		closeTag := liCloseTag
+		if node.ListFlags&ListTypeDefinition != 0 {
+			openTag = ddTag
+			closeTag = ddCloseTag
+		}
+		if node.ListFlags&ListTypeTerm != 0 {
+			openTag = dtTag
+			closeTag = dtCloseTag
+		}
+		if entering {
+			if itemOpenCR(node) {
+				r.cr(w)
+			}
+			if node.ListData.RefLink != nil {
+				slug := slugify(node.ListData.RefLink)
+				r.out(w, footnoteItem(r.FootnoteAnchorPrefix, slug))
+				break
+			}
+			r.out(w, openTag)
+		} else {
+			if node.ListData.RefLink != nil {
+				slug := slugify(node.ListData.RefLink)
+				if r.Flags&FootnoteReturnLinks != 0 {
+					r.out(w, footnoteReturnLink(r.FootnoteAnchorPrefix, r.FootnoteReturnLinkContents, slug))
+				}
+			}
+			r.out(w, closeTag)
+			r.cr(w)
+		}
+	case CodeBlock:
+		attrs = appendLanguageAttr(attrs, node.Info)
+		r.cr(w)
+		r.out(w, preTag)
+		r.tag(w, codeTag[:len(codeTag)-1], attrs)
+		escapeAllHTML(w, node.Literal)
+		r.out(w, codeCloseTag)
+		r.out(w, preCloseTag)
+		if node.Parent.Type != Item {
+			r.cr(w)
+		}
+	case Table:
+		if entering {
+			r.cr(w)
+			r.out(w, tableTag)
+		} else {
+			r.out(w, tableCloseTag)
+			r.cr(w)
+		}
+	case TableCell:
+		openTag := tdTag
+		closeTag := tdCloseTag
+		if node.IsHeader {
+			openTag = thTag
+			closeTag = thCloseTag
+		}
+		if entering {
+			align := cellAlignment(node.Align)
+			if align != "" {
+				attrs = append(attrs, fmt.Sprintf(`align="%s"`, align))
+			}
+			if node.Prev == nil {
+				r.cr(w)
+			}
+			r.tag(w, openTag, attrs)
+		} else {
+			r.out(w, closeTag)
+			r.cr(w)
+		}
+	case TableHead:
+		if entering {
+			r.cr(w)
+			r.out(w, theadTag)
+		} else {
+			r.out(w, theadCloseTag)
+			r.cr(w)
+		}
+	case TableBody:
+		if entering {
+			r.cr(w)
+			r.out(w, tbodyTag)
+			// XXX: this is to adhere to a rather silly test. Should fix test.
+			if node.FirstChild == nil {
+				r.cr(w)
+			}
+		} else {
+			r.out(w, tbodyCloseTag)
+			r.cr(w)
+		}
+	case TableRow:
+		if entering {
+			r.cr(w)
+			r.out(w, trTag)
+		} else {
+			r.out(w, trCloseTag)
+			r.cr(w)
+		}
+	default:
+		panic("Unknown node type " + node.Type.String())
+	}
+	return GoToNext
+}
+
+// RenderHeader writes HTML document preamble and TOC if requested.
+func (r *HTMLRenderer) RenderHeader(w io.Writer, ast *Node) {
+	r.writeDocumentHeader(w)
+	if r.Flags&TOC != 0 {
+		r.writeTOC(w, ast)
+	}
+}
+
+// RenderFooter writes HTML document footer.
+func (r *HTMLRenderer) RenderFooter(w io.Writer, ast *Node) {
+	if r.Flags&CompletePage == 0 {
+		return
+	}
+	io.WriteString(w, "\n</body>\n</html>\n")
+}
+
+func (r *HTMLRenderer) writeDocumentHeader(w io.Writer) {
+	if r.Flags&CompletePage == 0 {
+		return
+	}
+	ending := ""
+	if r.Flags&UseXHTML != 0 {
+		io.WriteString(w, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ")
+		io.WriteString(w, "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n")
+		io.WriteString(w, "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n")
+		ending = " /"
+	} else {
+		io.WriteString(w, "<!DOCTYPE html>\n")
+		io.WriteString(w, "<html>\n")
+	}
+	io.WriteString(w, "<head>\n")
+	io.WriteString(w, "  <title>")
+	if r.Flags&Smartypants != 0 {
+		r.sr.Process(w, []byte(r.Title))
+	} else {
+		escapeHTML(w, []byte(r.Title))
+	}
+	io.WriteString(w, "</title>\n")
+	io.WriteString(w, "  <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v")
+	io.WriteString(w, Version)
+	io.WriteString(w, "\"")
+	io.WriteString(w, ending)
+	io.WriteString(w, ">\n")
+	io.WriteString(w, "  <meta charset=\"utf-8\"")
+	io.WriteString(w, ending)
+	io.WriteString(w, ">\n")
+	if r.CSS != "" {
+		io.WriteString(w, "  <link rel=\"stylesheet\" type=\"text/css\" href=\"")
+		escapeHTML(w, []byte(r.CSS))
+		io.WriteString(w, "\"")
+		io.WriteString(w, ending)
+		io.WriteString(w, ">\n")
+	}
+	if r.Icon != "" {
+		io.WriteString(w, "  <link rel=\"icon\" type=\"image/x-icon\" href=\"")
+		escapeHTML(w, []byte(r.Icon))
+		io.WriteString(w, "\"")
+		io.WriteString(w, ending)
+		io.WriteString(w, ">\n")
+	}
+	io.WriteString(w, "</head>\n")
+	io.WriteString(w, "<body>\n\n")
+}
+
+func (r *HTMLRenderer) writeTOC(w io.Writer, ast *Node) {
+	buf := bytes.Buffer{}
+
+	inHeading := false
+	tocLevel := 0
+	headingCount := 0
+
+	ast.Walk(func(node *Node, entering bool) WalkStatus {
+		if node.Type == Heading && !node.HeadingData.IsTitleblock {
+			inHeading = entering
+			if entering {
+				node.HeadingID = fmt.Sprintf("toc_%d", headingCount)
+				if node.Level == tocLevel {
+					buf.WriteString("</li>\n\n<li>")
+				} else if node.Level < tocLevel {
+					for node.Level < tocLevel {
+						tocLevel--
+						buf.WriteString("</li>\n</ul>")
+					}
+					buf.WriteString("</li>\n\n<li>")
+				} else {
+					for node.Level > tocLevel {
+						tocLevel++
+						buf.WriteString("\n<ul>\n<li>")
+					}
+				}
+
+				fmt.Fprintf(&buf, `<a href="#toc_%d">`, headingCount)
+				headingCount++
+			} else {
+				buf.WriteString("</a>")
+			}
+			return GoToNext
+		}
+
+		if inHeading {
+			return r.RenderNode(&buf, node, entering)
+		}
+
+		return GoToNext
+	})
+
+	for ; tocLevel > 0; tocLevel-- {
+		buf.WriteString("</li>\n</ul>")
+	}
+
+	if buf.Len() > 0 {
+		io.WriteString(w, "<nav>\n")
+		w.Write(buf.Bytes())
+		io.WriteString(w, "\n\n</nav>\n")
+	}
+	r.lastOutputLen = buf.Len()
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/inline.go b/test/tools/vendor/github.com/russross/blackfriday/v2/inline.go
new file mode 100644
index 000000000..d45bd9417
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/inline.go
@@ -0,0 +1,1228 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+// Functions to parse inline elements.
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"regexp"
+	"strconv"
+)
+
+var (
+	urlRe    = `((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+`
+	anchorRe = regexp.MustCompile(`^(<a\shref="` + urlRe + `"(\stitle="[^"<>]+")?\s?>` + urlRe + `<\/a>)`)
+
+	// https://www.w3.org/TR/html5/syntax.html#character-references
+	// highest unicode code point in 17 planes (2^20): 1,114,112d =
+	// 7 dec digits or 6 hex digits
+	// named entity references can be 2-31 characters with stuff like &lt;
+	// at one end and &CounterClockwiseContourIntegral; at the other. There
+	// are also sometimes numbers at the end, although this isn't inherent
+	// in the specification; there are never numbers anywhere else in
+	// current character references, though; see &frac34; and &blk12;, etc.
+	// https://www.w3.org/TR/html5/syntax.html#named-character-references
+	//
+	// entity := "&" (named group | number ref) ";"
+	// named group := [a-zA-Z]{2,31}[0-9]{0,2}
+	// number ref := "#" (dec ref | hex ref)
+	// dec ref := [0-9]{1,7}
+	// hex ref := ("x" | "X") [0-9a-fA-F]{1,6}
+	htmlEntityRe = regexp.MustCompile(`&([a-zA-Z]{2,31}[0-9]{0,2}|#([0-9]{1,7}|[xX][0-9a-fA-F]{1,6}));`)
+)
+
+// Functions to parse text within a block
+// Each function returns the number of chars taken care of
+// data is the complete block being rendered
+// offset is the number of valid chars before the current cursor
+
+func (p *Markdown) inline(currBlock *Node, data []byte) {
+	// handlers might call us recursively: enforce a maximum depth
+	if p.nesting >= p.maxNesting || len(data) == 0 {
+		return
+	}
+	p.nesting++
+	beg, end := 0, 0
+	for end < len(data) {
+		handler := p.inlineCallback[data[end]]
+		if handler != nil {
+			if consumed, node := handler(p, data, end); consumed == 0 {
+				// No action from the callback.
+				end++
+			} else {
+				// Copy inactive chars into the output.
+				currBlock.AppendChild(text(data[beg:end]))
+				if node != nil {
+					currBlock.AppendChild(node)
+				}
+				// Skip past whatever the callback used.
+				beg = end + consumed
+				end = beg
+			}
+		} else {
+			end++
+		}
+	}
+	if beg < len(data) {
+		if data[end-1] == '\n' {
+			end--
+		}
+		currBlock.AppendChild(text(data[beg:end]))
+	}
+	p.nesting--
+}
+
+// single and double emphasis parsing
+func emphasis(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+	c := data[0]
+
+	if len(data) > 2 && data[1] != c {
+		// whitespace cannot follow an opening emphasis;
+		// strikethrough only takes two characters '~~'
+		if c == '~' || isspace(data[1]) {
+			return 0, nil
+		}
+		ret, node := helperEmphasis(p, data[1:], c)
+		if ret == 0 {
+			return 0, nil
+		}
+
+		return ret + 1, node
+	}
+
+	if len(data) > 3 && data[1] == c && data[2] != c {
+		if isspace(data[2]) {
+			return 0, nil
+		}
+		ret, node := helperDoubleEmphasis(p, data[2:], c)
+		if ret == 0 {
+			return 0, nil
+		}
+
+		return ret + 2, node
+	}
+
+	if len(data) > 4 && data[1] == c && data[2] == c && data[3] != c {
+		if c == '~' || isspace(data[3]) {
+			return 0, nil
+		}
+		ret, node := helperTripleEmphasis(p, data, 3, c)
+		if ret == 0 {
+			return 0, nil
+		}
+
+		return ret + 3, node
+	}
+
+	return 0, nil
+}
+
+func codeSpan(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+
+	nb := 0
+
+	// count the number of backticks in the delimiter
+	for nb < len(data) && data[nb] == '`' {
+		nb++
+	}
+
+	// find the next delimiter
+	i, end := 0, 0
+	for end = nb; end < len(data) && i < nb; end++ {
+		if data[end] == '`' {
+			i++
+		} else {
+			i = 0
+		}
+	}
+
+	// no matching delimiter?
+	if i < nb && end >= len(data) {
+		return 0, nil
+	}
+
+	// trim outside whitespace
+	fBegin := nb
+	for fBegin < end && data[fBegin] == ' ' {
+		fBegin++
+	}
+
+	fEnd := end - nb
+	for fEnd > fBegin && data[fEnd-1] == ' ' {
+		fEnd--
+	}
+
+	// render the code span
+	if fBegin != fEnd {
+		code := NewNode(Code)
+		code.Literal = data[fBegin:fEnd]
+		return end, code
+	}
+
+	return end, nil
+}
+
+// newline preceded by two spaces becomes <br>
+func maybeLineBreak(p *Markdown, data []byte, offset int) (int, *Node) {
+	origOffset := offset
+	for offset < len(data) && data[offset] == ' ' {
+		offset++
+	}
+
+	if offset < len(data) && data[offset] == '\n' {
+		if offset-origOffset >= 2 {
+			return offset - origOffset + 1, NewNode(Hardbreak)
+		}
+		return offset - origOffset, nil
+	}
+	return 0, nil
+}
+
+// newline without two spaces works when HardLineBreak is enabled
+func lineBreak(p *Markdown, data []byte, offset int) (int, *Node) {
+	if p.extensions&HardLineBreak != 0 {
+		return 1, NewNode(Hardbreak)
+	}
+	return 0, nil
+}
+
+type linkType int
+
+const (
+	linkNormal linkType = iota
+	linkImg
+	linkDeferredFootnote
+	linkInlineFootnote
+)
+
+func isReferenceStyleLink(data []byte, pos int, t linkType) bool {
+	if t == linkDeferredFootnote {
+		return false
+	}
+	return pos < len(data)-1 && data[pos] == '[' && data[pos+1] != '^'
+}
+
+func maybeImage(p *Markdown, data []byte, offset int) (int, *Node) {
+	if offset < len(data)-1 && data[offset+1] == '[' {
+		return link(p, data, offset)
+	}
+	return 0, nil
+}
+
+func maybeInlineFootnote(p *Markdown, data []byte, offset int) (int, *Node) {
+	if offset < len(data)-1 && data[offset+1] == '[' {
+		return link(p, data, offset)
+	}
+	return 0, nil
+}
+
+// '[': parse a link or an image or a footnote
+func link(p *Markdown, data []byte, offset int) (int, *Node) {
+	// no links allowed inside regular links, footnote, and deferred footnotes
+	if p.insideLink && (offset > 0 && data[offset-1] == '[' || len(data)-1 > offset && data[offset+1] == '^') {
+		return 0, nil
+	}
+
+	var t linkType
+	switch {
+	// special case: ![^text] == deferred footnote (that follows something with
+	// an exclamation point)
+	case p.extensions&Footnotes != 0 && len(data)-1 > offset && data[offset+1] == '^':
+		t = linkDeferredFootnote
+	// ![alt] == image
+	case offset >= 0 && data[offset] == '!':
+		t = linkImg
+		offset++
+	// ^[text] == inline footnote
+	// [^refId] == deferred footnote
+	case p.extensions&Footnotes != 0:
+		if offset >= 0 && data[offset] == '^' {
+			t = linkInlineFootnote
+			offset++
+		} else if len(data)-1 > offset && data[offset+1] == '^' {
+			t = linkDeferredFootnote
+		}
+	// [text] == regular link
+	default:
+		t = linkNormal
+	}
+
+	data = data[offset:]
+
+	var (
+		i                       = 1
+		noteID                  int
+		title, link, altContent []byte
+		textHasNl               = false
+	)
+
+	if t == linkDeferredFootnote {
+		i++
+	}
+
+	// look for the matching closing bracket
+	for level := 1; level > 0 && i < len(data); i++ {
+		switch {
+		case data[i] == '\n':
+			textHasNl = true
+
+		case isBackslashEscaped(data, i):
+			continue
+
+		case data[i] == '[':
+			level++
+
+		case data[i] == ']':
+			level--
+			if level <= 0 {
+				i-- // compensate for extra i++ in for loop
+			}
+		}
+	}
+
+	if i >= len(data) {
+		return 0, nil
+	}
+
+	txtE := i
+	i++
+	var footnoteNode *Node
+
+	// skip any amount of whitespace or newline
+	// (this is much more lax than original markdown syntax)
+	for i < len(data) && isspace(data[i]) {
+		i++
+	}
+
+	// inline style link
+	switch {
+	case i < len(data) && data[i] == '(':
+		// skip initial whitespace
+		i++
+
+		for i < len(data) && isspace(data[i]) {
+			i++
+		}
+
+		linkB := i
+
+		// look for link end: ' " )
+	findlinkend:
+		for i < len(data) {
+			switch {
+			case data[i] == '\\':
+				i += 2
+
+			case data[i] == ')' || data[i] == '\'' || data[i] == '"':
+				break findlinkend
+
+			default:
+				i++
+			}
+		}
+
+		if i >= len(data) {
+			return 0, nil
+		}
+		linkE := i
+
+		// look for title end if present
+		titleB, titleE := 0, 0
+		if data[i] == '\'' || data[i] == '"' {
+			i++
+			titleB = i
+
+		findtitleend:
+			for i < len(data) {
+				switch {
+				case data[i] == '\\':
+					i += 2
+
+				case data[i] == ')':
+					break findtitleend
+
+				default:
+					i++
+				}
+			}
+
+			if i >= len(data) {
+				return 0, nil
+			}
+
+			// skip whitespace after title
+			titleE = i - 1
+			for titleE > titleB && isspace(data[titleE]) {
+				titleE--
+			}
+
+			// check for closing quote presence
+			if data[titleE] != '\'' && data[titleE] != '"' {
+				titleB, titleE = 0, 0
+				linkE = i
+			}
+		}
+
+		// remove whitespace at the end of the link
+		for linkE > linkB && isspace(data[linkE-1]) {
+			linkE--
+		}
+
+		// remove optional angle brackets around the link
+		if data[linkB] == '<' {
+			linkB++
+		}
+		if data[linkE-1] == '>' {
+			linkE--
+		}
+
+		// build escaped link and title
+		if linkE > linkB {
+			link = data[linkB:linkE]
+		}
+
+		if titleE > titleB {
+			title = data[titleB:titleE]
+		}
+
+		i++
+
+	// reference style link
+	case isReferenceStyleLink(data, i, t):
+		var id []byte
+		altContentConsidered := false
+
+		// look for the id
+		i++
+		linkB := i
+		for i < len(data) && data[i] != ']' {
+			i++
+		}
+		if i >= len(data) {
+			return 0, nil
+		}
+		linkE := i
+
+		// find the reference
+		if linkB == linkE {
+			if textHasNl {
+				var b bytes.Buffer
+
+				for j := 1; j < txtE; j++ {
+					switch {
+					case data[j] != '\n':
+						b.WriteByte(data[j])
+					case data[j-1] != ' ':
+						b.WriteByte(' ')
+					}
+				}
+
+				id = b.Bytes()
+			} else {
+				id = data[1:txtE]
+				altContentConsidered = true
+			}
+		} else {
+			id = data[linkB:linkE]
+		}
+
+		// find the reference with matching id
+		lr, ok := p.getRef(string(id))
+		if !ok {
+			return 0, nil
+		}
+
+		// keep link and title from reference
+		link = lr.link
+		title = lr.title
+		if altContentConsidered {
+			altContent = lr.text
+		}
+		i++
+
+	// shortcut reference style link or reference or inline footnote
+	default:
+		var id []byte
+
+		// craft the id
+		if textHasNl {
+			var b bytes.Buffer
+
+			for j := 1; j < txtE; j++ {
+				switch {
+				case data[j] != '\n':
+					b.WriteByte(data[j])
+				case data[j-1] != ' ':
+					b.WriteByte(' ')
+				}
+			}
+
+			id = b.Bytes()
+		} else {
+			if t == linkDeferredFootnote {
+				id = data[2:txtE] // get rid of the ^
+			} else {
+				id = data[1:txtE]
+			}
+		}
+
+		footnoteNode = NewNode(Item)
+		if t == linkInlineFootnote {
+			// create a new reference
+			noteID = len(p.notes) + 1
+
+			var fragment []byte
+			if len(id) > 0 {
+				if len(id) < 16 {
+					fragment = make([]byte, len(id))
+				} else {
+					fragment = make([]byte, 16)
+				}
+				copy(fragment, slugify(id))
+			} else {
+				fragment = append([]byte("footnote-"), []byte(strconv.Itoa(noteID))...)
+			}
+
+			ref := &reference{
+				noteID:   noteID,
+				hasBlock: false,
+				link:     fragment,
+				title:    id,
+				footnote: footnoteNode,
+			}
+
+			p.notes = append(p.notes, ref)
+
+			link = ref.link
+			title = ref.title
+		} else {
+			// find the reference with matching id
+			lr, ok := p.getRef(string(id))
+			if !ok {
+				return 0, nil
+			}
+
+			if t == linkDeferredFootnote {
+				lr.noteID = len(p.notes) + 1
+				lr.footnote = footnoteNode
+				p.notes = append(p.notes, lr)
+			}
+
+			// keep link and title from reference
+			link = lr.link
+			// if inline footnote, title == footnote contents
+			title = lr.title
+			noteID = lr.noteID
+		}
+
+		// rewind the whitespace
+		i = txtE + 1
+	}
+
+	var uLink []byte
+	if t == linkNormal || t == linkImg {
+		if len(link) > 0 {
+			var uLinkBuf bytes.Buffer
+			unescapeText(&uLinkBuf, link)
+			uLink = uLinkBuf.Bytes()
+		}
+
+		// links need something to click on and somewhere to go
+		if len(uLink) == 0 || (t == linkNormal && txtE <= 1) {
+			return 0, nil
+		}
+	}
+
+	// call the relevant rendering function
+	var linkNode *Node
+	switch t {
+	case linkNormal:
+		linkNode = NewNode(Link)
+		linkNode.Destination = normalizeURI(uLink)
+		linkNode.Title = title
+		if len(altContent) > 0 {
+			linkNode.AppendChild(text(altContent))
+		} else {
+			// links cannot contain other links, so turn off link parsing
+			// temporarily and recurse
+			insideLink := p.insideLink
+			p.insideLink = true
+			p.inline(linkNode, data[1:txtE])
+			p.insideLink = insideLink
+		}
+
+	case linkImg:
+		linkNode = NewNode(Image)
+		linkNode.Destination = uLink
+		linkNode.Title = title
+		linkNode.AppendChild(text(data[1:txtE]))
+		i++
+
+	case linkInlineFootnote, linkDeferredFootnote:
+		linkNode = NewNode(Link)
+		linkNode.Destination = link
+		linkNode.Title = title
+		linkNode.NoteID = noteID
+		linkNode.Footnote = footnoteNode
+		if t == linkInlineFootnote {
+			i++
+		}
+
+	default:
+		return 0, nil
+	}
+
+	return i, linkNode
+}
+
+func (p *Markdown) inlineHTMLComment(data []byte) int {
+	if len(data) < 5 {
+		return 0
+	}
+	if data[0] != '<' || data[1] != '!' || data[2] != '-' || data[3] != '-' {
+		return 0
+	}
+	i := 5
+	// scan for an end-of-comment marker, across lines if necessary
+	for i < len(data) && !(data[i-2] == '-' && data[i-1] == '-' && data[i] == '>') {
+		i++
+	}
+	// no end-of-comment marker
+	if i >= len(data) {
+		return 0
+	}
+	return i + 1
+}
+
+func stripMailto(link []byte) []byte {
+	if bytes.HasPrefix(link, []byte("mailto://")) {
+		return link[9:]
+	} else if bytes.HasPrefix(link, []byte("mailto:")) {
+		return link[7:]
+	} else {
+		return link
+	}
+}
+
+// autolinkType specifies a kind of autolink that gets detected.
+type autolinkType int
+
+// These are the possible flag values for the autolink renderer.
+const (
+	notAutolink autolinkType = iota
+	normalAutolink
+	emailAutolink
+)
+
+// '<' when tags or autolinks are allowed
+func leftAngle(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+	altype, end := tagLength(data)
+	if size := p.inlineHTMLComment(data); size > 0 {
+		end = size
+	}
+	if end > 2 {
+		if altype != notAutolink {
+			var uLink bytes.Buffer
+			unescapeText(&uLink, data[1:end+1-2])
+			if uLink.Len() > 0 {
+				link := uLink.Bytes()
+				node := NewNode(Link)
+				node.Destination = link
+				if altype == emailAutolink {
+					node.Destination = append([]byte("mailto:"), link...)
+				}
+				node.AppendChild(text(stripMailto(link)))
+				return end, node
+			}
+		} else {
+			htmlTag := NewNode(HTMLSpan)
+			htmlTag.Literal = data[:end]
+			return end, htmlTag
+		}
+	}
+
+	return end, nil
+}
+
+// '\\' backslash escape
+var escapeChars = []byte("\\`*_{}[]()#+-.!:|&<>~")
+
+func escape(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+
+	if len(data) > 1 {
+		if p.extensions&BackslashLineBreak != 0 && data[1] == '\n' {
+			return 2, NewNode(Hardbreak)
+		}
+		if bytes.IndexByte(escapeChars, data[1]) < 0 {
+			return 0, nil
+		}
+
+		return 2, text(data[1:2])
+	}
+
+	return 2, nil
+}
+
+func unescapeText(ob *bytes.Buffer, src []byte) {
+	i := 0
+	for i < len(src) {
+		org := i
+		for i < len(src) && src[i] != '\\' {
+			i++
+		}
+
+		if i > org {
+			ob.Write(src[org:i])
+		}
+
+		if i+1 >= len(src) {
+			break
+		}
+
+		ob.WriteByte(src[i+1])
+		i += 2
+	}
+}
+
+// '&' escaped when it doesn't belong to an entity
+// valid entities are assumed to be anything matching &#?[A-Za-z0-9]+;
+func entity(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+
+	end := 1
+
+	if end < len(data) && data[end] == '#' {
+		end++
+	}
+
+	for end < len(data) && isalnum(data[end]) {
+		end++
+	}
+
+	if end < len(data) && data[end] == ';' {
+		end++ // real entity
+	} else {
+		return 0, nil // lone '&'
+	}
+
+	ent := data[:end]
+	// undo &amp; escaping or it will be converted to &amp;amp; by another
+	// escaper in the renderer
+	if bytes.Equal(ent, []byte("&amp;")) {
+		ent = []byte{'&'}
+	}
+
+	return end, text(ent)
+}
+
+func linkEndsWithEntity(data []byte, linkEnd int) bool {
+	entityRanges := htmlEntityRe.FindAllIndex(data[:linkEnd], -1)
+	return entityRanges != nil && entityRanges[len(entityRanges)-1][1] == linkEnd
+}
+
+// hasPrefixCaseInsensitive is a custom implementation of
+//     strings.HasPrefix(strings.ToLower(s), prefix)
+// we rolled our own because ToLower pulls in a huge machinery of lowercasing
+// anything from Unicode and that's very slow. Since this func will only be
+// used on ASCII protocol prefixes, we can take shortcuts.
+func hasPrefixCaseInsensitive(s, prefix []byte) bool {
+	if len(s) < len(prefix) {
+		return false
+	}
+	delta := byte('a' - 'A')
+	for i, b := range prefix {
+		if b != s[i] && b != s[i]+delta {
+			return false
+		}
+	}
+	return true
+}
+
+var protocolPrefixes = [][]byte{
+	[]byte("http://"),
+	[]byte("https://"),
+	[]byte("ftp://"),
+	[]byte("file://"),
+	[]byte("mailto:"),
+}
+
+const shortestPrefix = 6 // len("ftp://"), the shortest of the above
+
+func maybeAutoLink(p *Markdown, data []byte, offset int) (int, *Node) {
+	// quick check to rule out most false hits
+	if p.insideLink || len(data) < offset+shortestPrefix {
+		return 0, nil
+	}
+	for _, prefix := range protocolPrefixes {
+		endOfHead := offset + 8 // 8 is the len() of the longest prefix
+		if endOfHead > len(data) {
+			endOfHead = len(data)
+		}
+		if hasPrefixCaseInsensitive(data[offset:endOfHead], prefix) {
+			return autoLink(p, data, offset)
+		}
+	}
+	return 0, nil
+}
+
+func autoLink(p *Markdown, data []byte, offset int) (int, *Node) {
+	// Now a more expensive check to see if we're not inside an anchor element
+	anchorStart := offset
+	offsetFromAnchor := 0
+	for anchorStart > 0 && data[anchorStart] != '<' {
+		anchorStart--
+		offsetFromAnchor++
+	}
+
+	anchorStr := anchorRe.Find(data[anchorStart:])
+	if anchorStr != nil {
+		anchorClose := NewNode(HTMLSpan)
+		anchorClose.Literal = anchorStr[offsetFromAnchor:]
+		return len(anchorStr) - offsetFromAnchor, anchorClose
+	}
+
+	// scan backward for a word boundary
+	rewind := 0
+	for offset-rewind > 0 && rewind <= 7 && isletter(data[offset-rewind-1]) {
+		rewind++
+	}
+	if rewind > 6 { // longest supported protocol is "mailto" which has 6 letters
+		return 0, nil
+	}
+
+	origData := data
+	data = data[offset-rewind:]
+
+	if !isSafeLink(data) {
+		return 0, nil
+	}
+
+	linkEnd := 0
+	for linkEnd < len(data) && !isEndOfLink(data[linkEnd]) {
+		linkEnd++
+	}
+
+	// Skip punctuation at the end of the link
+	if (data[linkEnd-1] == '.' || data[linkEnd-1] == ',') && data[linkEnd-2] != '\\' {
+		linkEnd--
+	}
+
+	// But don't skip semicolon if it's a part of escaped entity:
+	if data[linkEnd-1] == ';' && data[linkEnd-2] != '\\' && !linkEndsWithEntity(data, linkEnd) {
+		linkEnd--
+	}
+
+	// See if the link finishes with a punctuation sign that can be closed.
+	var copen byte
+	switch data[linkEnd-1] {
+	case '"':
+		copen = '"'
+	case '\'':
+		copen = '\''
+	case ')':
+		copen = '('
+	case ']':
+		copen = '['
+	case '}':
+		copen = '{'
+	default:
+		copen = 0
+	}
+
+	if copen != 0 {
+		bufEnd := offset - rewind + linkEnd - 2
+
+		openDelim := 1
+
+		/* Try to close the final punctuation sign in this same line;
+		 * if we managed to close it outside of the URL, that means that it's
+		 * not part of the URL. If it closes inside the URL, that means it
+		 * is part of the URL.
+		 *
+		 * Examples:
+		 *
+		 *      foo http://www.pokemon.com/Pikachu_(Electric) bar
+		 *              => http://www.pokemon.com/Pikachu_(Electric)
+		 *
+		 *      foo (http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *              => http://www.pokemon.com/Pikachu_(Electric)
+		 *
+		 *      foo http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *              => http://www.pokemon.com/Pikachu_(Electric))
+		 *
+		 *      (foo http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *              => foo http://www.pokemon.com/Pikachu_(Electric)
+		 */
+
+		for bufEnd >= 0 && origData[bufEnd] != '\n' && openDelim != 0 {
+			if origData[bufEnd] == data[linkEnd-1] {
+				openDelim++
+			}
+
+			if origData[bufEnd] == copen {
+				openDelim--
+			}
+
+			bufEnd--
+		}
+
+		if openDelim == 0 {
+			linkEnd--
+		}
+	}
+
+	var uLink bytes.Buffer
+	unescapeText(&uLink, data[:linkEnd])
+
+	if uLink.Len() > 0 {
+		node := NewNode(Link)
+		node.Destination = uLink.Bytes()
+		node.AppendChild(text(uLink.Bytes()))
+		return linkEnd, node
+	}
+
+	return linkEnd, nil
+}
+
+func isEndOfLink(char byte) bool {
+	return isspace(char) || char == '<'
+}
+
+var validUris = [][]byte{[]byte("http://"), []byte("https://"), []byte("ftp://"), []byte("mailto://")}
+var validPaths = [][]byte{[]byte("/"), []byte("./"), []byte("../")}
+
+func isSafeLink(link []byte) bool {
+	for _, path := range validPaths {
+		if len(link) >= len(path) && bytes.Equal(link[:len(path)], path) {
+			if len(link) == len(path) {
+				return true
+			} else if isalnum(link[len(path)]) {
+				return true
+			}
+		}
+	}
+
+	for _, prefix := range validUris {
+		// TODO: handle unicode here
+		// case-insensitive prefix test
+		if len(link) > len(prefix) && bytes.Equal(bytes.ToLower(link[:len(prefix)]), prefix) && isalnum(link[len(prefix)]) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// return the length of the given tag, or 0 is it's not valid
+func tagLength(data []byte) (autolink autolinkType, end int) {
+	var i, j int
+
+	// a valid tag can't be shorter than 3 chars
+	if len(data) < 3 {
+		return notAutolink, 0
+	}
+
+	// begins with a '<' optionally followed by '/', followed by letter or number
+	if data[0] != '<' {
+		return notAutolink, 0
+	}
+	if data[1] == '/' {
+		i = 2
+	} else {
+		i = 1
+	}
+
+	if !isalnum(data[i]) {
+		return notAutolink, 0
+	}
+
+	// scheme test
+	autolink = notAutolink
+
+	// try to find the beginning of an URI
+	for i < len(data) && (isalnum(data[i]) || data[i] == '.' || data[i] == '+' || data[i] == '-') {
+		i++
+	}
+
+	if i > 1 && i < len(data) && data[i] == '@' {
+		if j = isMailtoAutoLink(data[i:]); j != 0 {
+			return emailAutolink, i + j
+		}
+	}
+
+	if i > 2 && i < len(data) && data[i] == ':' {
+		autolink = normalAutolink
+		i++
+	}
+
+	// complete autolink test: no whitespace or ' or "
+	switch {
+	case i >= len(data):
+		autolink = notAutolink
+	case autolink != notAutolink:
+		j = i
+
+		for i < len(data) {
+			if data[i] == '\\' {
+				i += 2
+			} else if data[i] == '>' || data[i] == '\'' || data[i] == '"' || isspace(data[i]) {
+				break
+			} else {
+				i++
+			}
+
+		}
+
+		if i >= len(data) {
+			return autolink, 0
+		}
+		if i > j && data[i] == '>' {
+			return autolink, i + 1
+		}
+
+		// one of the forbidden chars has been found
+		autolink = notAutolink
+	}
+	i += bytes.IndexByte(data[i:], '>')
+	if i < 0 {
+		return autolink, 0
+	}
+	return autolink, i + 1
+}
+
+// look for the address part of a mail autolink and '>'
+// this is less strict than the original markdown e-mail address matching
+func isMailtoAutoLink(data []byte) int {
+	nb := 0
+
+	// address is assumed to be: [-@._a-zA-Z0-9]+ with exactly one '@'
+	for i := 0; i < len(data); i++ {
+		if isalnum(data[i]) {
+			continue
+		}
+
+		switch data[i] {
+		case '@':
+			nb++
+
+		case '-', '.', '_':
+			break
+
+		case '>':
+			if nb == 1 {
+				return i + 1
+			}
+			return 0
+		default:
+			return 0
+		}
+	}
+
+	return 0
+}
+
+// look for the next emph char, skipping other constructs
+func helperFindEmphChar(data []byte, c byte) int {
+	i := 0
+
+	for i < len(data) {
+		for i < len(data) && data[i] != c && data[i] != '`' && data[i] != '[' {
+			i++
+		}
+		if i >= len(data) {
+			return 0
+		}
+		// do not count escaped chars
+		if i != 0 && data[i-1] == '\\' {
+			i++
+			continue
+		}
+		if data[i] == c {
+			return i
+		}
+
+		if data[i] == '`' {
+			// skip a code span
+			tmpI := 0
+			i++
+			for i < len(data) && data[i] != '`' {
+				if tmpI == 0 && data[i] == c {
+					tmpI = i
+				}
+				i++
+			}
+			if i >= len(data) {
+				return tmpI
+			}
+			i++
+		} else if data[i] == '[' {
+			// skip a link
+			tmpI := 0
+			i++
+			for i < len(data) && data[i] != ']' {
+				if tmpI == 0 && data[i] == c {
+					tmpI = i
+				}
+				i++
+			}
+			i++
+			for i < len(data) && (data[i] == ' ' || data[i] == '\n') {
+				i++
+			}
+			if i >= len(data) {
+				return tmpI
+			}
+			if data[i] != '[' && data[i] != '(' { // not a link
+				if tmpI > 0 {
+					return tmpI
+				}
+				continue
+			}
+			cc := data[i]
+			i++
+			for i < len(data) && data[i] != cc {
+				if tmpI == 0 && data[i] == c {
+					return i
+				}
+				i++
+			}
+			if i >= len(data) {
+				return tmpI
+			}
+			i++
+		}
+	}
+	return 0
+}
+
+func helperEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
+	i := 0
+
+	// skip one symbol if coming from emph3
+	if len(data) > 1 && data[0] == c && data[1] == c {
+		i = 1
+	}
+
+	for i < len(data) {
+		length := helperFindEmphChar(data[i:], c)
+		if length == 0 {
+			return 0, nil
+		}
+		i += length
+		if i >= len(data) {
+			return 0, nil
+		}
+
+		if i+1 < len(data) && data[i+1] == c {
+			i++
+			continue
+		}
+
+		if data[i] == c && !isspace(data[i-1]) {
+
+			if p.extensions&NoIntraEmphasis != 0 {
+				if !(i+1 == len(data) || isspace(data[i+1]) || ispunct(data[i+1])) {
+					continue
+				}
+			}
+
+			emph := NewNode(Emph)
+			p.inline(emph, data[:i])
+			return i + 1, emph
+		}
+	}
+
+	return 0, nil
+}
+
+func helperDoubleEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
+	i := 0
+
+	for i < len(data) {
+		length := helperFindEmphChar(data[i:], c)
+		if length == 0 {
+			return 0, nil
+		}
+		i += length
+
+		if i+1 < len(data) && data[i] == c && data[i+1] == c && i > 0 && !isspace(data[i-1]) {
+			nodeType := Strong
+			if c == '~' {
+				nodeType = Del
+			}
+			node := NewNode(nodeType)
+			p.inline(node, data[:i])
+			return i + 2, node
+		}
+		i++
+	}
+	return 0, nil
+}
+
+func helperTripleEmphasis(p *Markdown, data []byte, offset int, c byte) (int, *Node) {
+	i := 0
+	origData := data
+	data = data[offset:]
+
+	for i < len(data) {
+		length := helperFindEmphChar(data[i:], c)
+		if length == 0 {
+			return 0, nil
+		}
+		i += length
+
+		// skip whitespace preceded symbols
+		if data[i] != c || isspace(data[i-1]) {
+			continue
+		}
+
+		switch {
+		case i+2 < len(data) && data[i+1] == c && data[i+2] == c:
+			// triple symbol found
+			strong := NewNode(Strong)
+			em := NewNode(Emph)
+			strong.AppendChild(em)
+			p.inline(em, data[:i])
+			return i + 3, strong
+		case (i+1 < len(data) && data[i+1] == c):
+			// double symbol found, hand over to emph1
+			length, node := helperEmphasis(p, origData[offset-2:], c)
+			if length == 0 {
+				return 0, nil
+			}
+			return length - 2, node
+		default:
+			// single symbol found, hand over to emph2
+			length, node := helperDoubleEmphasis(p, origData[offset-1:], c)
+			if length == 0 {
+				return 0, nil
+			}
+			return length - 1, node
+		}
+	}
+	return 0, nil
+}
+
+func text(s []byte) *Node {
+	node := NewNode(Text)
+	node.Literal = s
+	return node
+}
+
+func normalizeURI(s []byte) []byte {
+	return s // TODO: implement
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/markdown.go b/test/tools/vendor/github.com/russross/blackfriday/v2/markdown.go
new file mode 100644
index 000000000..58d2e4538
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/markdown.go
@@ -0,0 +1,950 @@
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+
+package blackfriday
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+	"unicode/utf8"
+)
+
+//
+// Markdown parsing and processing
+//
+
+// Version string of the package. Appears in the rendered document when
+// CompletePage flag is on.
+const Version = "2.0"
+
+// Extensions is a bitwise or'ed collection of enabled Blackfriday's
+// extensions.
+type Extensions int
+
+// These are the supported markdown parsing extensions.
+// OR these values together to select multiple extensions.
+const (
+	NoExtensions           Extensions = 0
+	NoIntraEmphasis        Extensions = 1 << iota // Ignore emphasis markers inside words
+	Tables                                        // Render tables
+	FencedCode                                    // Render fenced code blocks
+	Autolink                                      // Detect embedded URLs that are not explicitly marked
+	Strikethrough                                 // Strikethrough text using ~~test~~
+	LaxHTMLBlocks                                 // Loosen up HTML block parsing rules
+	SpaceHeadings                                 // Be strict about prefix heading rules
+	HardLineBreak                                 // Translate newlines into line breaks
+	TabSizeEight                                  // Expand tabs to eight spaces instead of four
+	Footnotes                                     // Pandoc-style footnotes
+	NoEmptyLineBeforeBlock                        // No need to insert an empty line to start a (code, quote, ordered list, unordered list) block
+	HeadingIDs                                    // specify heading IDs  with {#id}
+	Titleblock                                    // Titleblock ala pandoc
+	AutoHeadingIDs                                // Create the heading ID from the text
+	BackslashLineBreak                            // Translate trailing backslashes into line breaks
+	DefinitionLists                               // Render definition lists
+
+	CommonHTMLFlags HTMLFlags = UseXHTML | Smartypants |
+		SmartypantsFractions | SmartypantsDashes | SmartypantsLatexDashes
+
+	CommonExtensions Extensions = NoIntraEmphasis | Tables | FencedCode |
+		Autolink | Strikethrough | SpaceHeadings | HeadingIDs |
+		BackslashLineBreak | DefinitionLists
+)
+
+// ListType contains bitwise or'ed flags for list and list item objects.
+type ListType int
+
+// These are the possible flag values for the ListItem renderer.
+// Multiple flag values may be ORed together.
+// These are mostly of interest if you are writing a new output format.
+const (
+	ListTypeOrdered ListType = 1 << iota
+	ListTypeDefinition
+	ListTypeTerm
+
+	ListItemContainsBlock
+	ListItemBeginningOfList // TODO: figure out if this is of any use now
+	ListItemEndOfList
+)
+
+// CellAlignFlags holds a type of alignment in a table cell.
+type CellAlignFlags int
+
+// These are the possible flag values for the table cell renderer.
+// Only a single one of these values will be used; they are not ORed together.
+// These are mostly of interest if you are writing a new output format.
+const (
+	TableAlignmentLeft CellAlignFlags = 1 << iota
+	TableAlignmentRight
+	TableAlignmentCenter = (TableAlignmentLeft | TableAlignmentRight)
+)
+
+// The size of a tab stop.
+const (
+	TabSizeDefault = 4
+	TabSizeDouble  = 8
+)
+
+// blockTags is a set of tags that are recognized as HTML block tags.
+// Any of these can be included in markdown text without special escaping.
+var blockTags = map[string]struct{}{
+	"blockquote": {},
+	"del":        {},
+	"div":        {},
+	"dl":         {},
+	"fieldset":   {},
+	"form":       {},
+	"h1":         {},
+	"h2":         {},
+	"h3":         {},
+	"h4":         {},
+	"h5":         {},
+	"h6":         {},
+	"iframe":     {},
+	"ins":        {},
+	"math":       {},
+	"noscript":   {},
+	"ol":         {},
+	"pre":        {},
+	"p":          {},
+	"script":     {},
+	"style":      {},
+	"table":      {},
+	"ul":         {},
+
+	// HTML5
+	"address":    {},
+	"article":    {},
+	"aside":      {},
+	"canvas":     {},
+	"figcaption": {},
+	"figure":     {},
+	"footer":     {},
+	"header":     {},
+	"hgroup":     {},
+	"main":       {},
+	"nav":        {},
+	"output":     {},
+	"progress":   {},
+	"section":    {},
+	"video":      {},
+}
+
+// Renderer is the rendering interface. This is mostly of interest if you are
+// implementing a new rendering format.
+//
+// Only an HTML implementation is provided in this repository, see the README
+// for external implementations.
+type Renderer interface {
+	// RenderNode is the main rendering method. It will be called once for
+	// every leaf node and twice for every non-leaf node (first with
+	// entering=true, then with entering=false). The method should write its
+	// rendition of the node to the supplied writer w.
+	RenderNode(w io.Writer, node *Node, entering bool) WalkStatus
+
+	// RenderHeader is a method that allows the renderer to produce some
+	// content preceding the main body of the output document. The header is
+	// understood in the broad sense here. For example, the default HTML
+	// renderer will write not only the HTML document preamble, but also the
+	// table of contents if it was requested.
+	//
+	// The method will be passed an entire document tree, in case a particular
+	// implementation needs to inspect it to produce output.
+	//
+	// The output should be written to the supplied writer w. If your
+	// implementation has no header to write, supply an empty implementation.
+	RenderHeader(w io.Writer, ast *Node)
+
+	// RenderFooter is a symmetric counterpart of RenderHeader.
+	RenderFooter(w io.Writer, ast *Node)
+}
+
+// Callback functions for inline parsing. One such function is defined
+// for each character that triggers a response when parsing inline data.
+type inlineParser func(p *Markdown, data []byte, offset int) (int, *Node)
+
+// Markdown is a type that holds extensions and the runtime state used by
+// Parse, and the renderer. You can not use it directly, construct it with New.
+type Markdown struct {
+	renderer          Renderer
+	referenceOverride ReferenceOverrideFunc
+	refs              map[string]*reference
+	inlineCallback    [256]inlineParser
+	extensions        Extensions
+	nesting           int
+	maxNesting        int
+	insideLink        bool
+
+	// Footnotes need to be ordered as well as available to quickly check for
+	// presence. If a ref is also a footnote, it's stored both in refs and here
+	// in notes. Slice is nil if footnotes not enabled.
+	notes []*reference
+
+	doc                  *Node
+	tip                  *Node // = doc
+	oldTip               *Node
+	lastMatchedContainer *Node // = doc
+	allClosed            bool
+}
+
+func (p *Markdown) getRef(refid string) (ref *reference, found bool) {
+	if p.referenceOverride != nil {
+		r, overridden := p.referenceOverride(refid)
+		if overridden {
+			if r == nil {
+				return nil, false
+			}
+			return &reference{
+				link:     []byte(r.Link),
+				title:    []byte(r.Title),
+				noteID:   0,
+				hasBlock: false,
+				text:     []byte(r.Text)}, true
+		}
+	}
+	// refs are case insensitive
+	ref, found = p.refs[strings.ToLower(refid)]
+	return ref, found
+}
+
+func (p *Markdown) finalize(block *Node) {
+	above := block.Parent
+	block.open = false
+	p.tip = above
+}
+
+func (p *Markdown) addChild(node NodeType, offset uint32) *Node {
+	return p.addExistingChild(NewNode(node), offset)
+}
+
+func (p *Markdown) addExistingChild(node *Node, offset uint32) *Node {
+	for !p.tip.canContain(node.Type) {
+		p.finalize(p.tip)
+	}
+	p.tip.AppendChild(node)
+	p.tip = node
+	return node
+}
+
+func (p *Markdown) closeUnmatchedBlocks() {
+	if !p.allClosed {
+		for p.oldTip != p.lastMatchedContainer {
+			parent := p.oldTip.Parent
+			p.finalize(p.oldTip)
+			p.oldTip = parent
+		}
+		p.allClosed = true
+	}
+}
+
+//
+//
+// Public interface
+//
+//
+
+// Reference represents the details of a link.
+// See the documentation in Options for more details on use-case.
+type Reference struct {
+	// Link is usually the URL the reference points to.
+	Link string
+	// Title is the alternate text describing the link in more detail.
+	Title string
+	// Text is the optional text to override the ref with if the syntax used was
+	// [refid][]
+	Text string
+}
+
+// ReferenceOverrideFunc is expected to be called with a reference string and
+// return either a valid Reference type that the reference string maps to or
+// nil. If overridden is false, the default reference logic will be executed.
+// See the documentation in Options for more details on use-case.
+type ReferenceOverrideFunc func(reference string) (ref *Reference, overridden bool)
+
+// New constructs a Markdown processor. You can use the same With* functions as
+// for Run() to customize parser's behavior and the renderer.
+func New(opts ...Option) *Markdown {
+	var p Markdown
+	for _, opt := range opts {
+		opt(&p)
+	}
+	p.refs = make(map[string]*reference)
+	p.maxNesting = 16
+	p.insideLink = false
+	docNode := NewNode(Document)
+	p.doc = docNode
+	p.tip = docNode
+	p.oldTip = docNode
+	p.lastMatchedContainer = docNode
+	p.allClosed = true
+	// register inline parsers
+	p.inlineCallback[' '] = maybeLineBreak
+	p.inlineCallback['*'] = emphasis
+	p.inlineCallback['_'] = emphasis
+	if p.extensions&Strikethrough != 0 {
+		p.inlineCallback['~'] = emphasis
+	}
+	p.inlineCallback['`'] = codeSpan
+	p.inlineCallback['\n'] = lineBreak
+	p.inlineCallback['['] = link
+	p.inlineCallback['<'] = leftAngle
+	p.inlineCallback['\\'] = escape
+	p.inlineCallback['&'] = entity
+	p.inlineCallback['!'] = maybeImage
+	p.inlineCallback['^'] = maybeInlineFootnote
+	if p.extensions&Autolink != 0 {
+		p.inlineCallback['h'] = maybeAutoLink
+		p.inlineCallback['m'] = maybeAutoLink
+		p.inlineCallback['f'] = maybeAutoLink
+		p.inlineCallback['H'] = maybeAutoLink
+		p.inlineCallback['M'] = maybeAutoLink
+		p.inlineCallback['F'] = maybeAutoLink
+	}
+	if p.extensions&Footnotes != 0 {
+		p.notes = make([]*reference, 0)
+	}
+	return &p
+}
+
+// Option customizes the Markdown processor's default behavior.
+type Option func(*Markdown)
+
+// WithRenderer allows you to override the default renderer.
+func WithRenderer(r Renderer) Option {
+	return func(p *Markdown) {
+		p.renderer = r
+	}
+}
+
+// WithExtensions allows you to pick some of the many extensions provided by
+// Blackfriday. You can bitwise OR them.
+func WithExtensions(e Extensions) Option {
+	return func(p *Markdown) {
+		p.extensions = e
+	}
+}
+
+// WithNoExtensions turns off all extensions and custom behavior.
+func WithNoExtensions() Option {
+	return func(p *Markdown) {
+		p.extensions = NoExtensions
+		p.renderer = NewHTMLRenderer(HTMLRendererParameters{
+			Flags: HTMLFlagsNone,
+		})
+	}
+}
+
+// WithRefOverride sets an optional function callback that is called every
+// time a reference is resolved.
+//
+// In Markdown, the link reference syntax can be made to resolve a link to
+// a reference instead of an inline URL, in one of the following ways:
+//
+//  * [link text][refid]
+//  * [refid][]
+//
+// Usually, the refid is defined at the bottom of the Markdown document. If
+// this override function is provided, the refid is passed to the override
+// function first, before consulting the defined refids at the bottom. If
+// the override function indicates an override did not occur, the refids at
+// the bottom will be used to fill in the link details.
+func WithRefOverride(o ReferenceOverrideFunc) Option {
+	return func(p *Markdown) {
+		p.referenceOverride = o
+	}
+}
+
+// Run is the main entry point to Blackfriday. It parses and renders a
+// block of markdown-encoded text.
+//
+// The simplest invocation of Run takes one argument, input:
+//     output := Run(input)
+// This will parse the input with CommonExtensions enabled and render it with
+// the default HTMLRenderer (with CommonHTMLFlags).
+//
+// Variadic arguments opts can customize the default behavior. Since Markdown
+// type does not contain exported fields, you can not use it directly. Instead,
+// use the With* functions. For example, this will call the most basic
+// functionality, with no extensions:
+//     output := Run(input, WithNoExtensions())
+//
+// You can use any number of With* arguments, even contradicting ones. They
+// will be applied in order of appearance and the latter will override the
+// former:
+//     output := Run(input, WithNoExtensions(), WithExtensions(exts),
+//         WithRenderer(yourRenderer))
+func Run(input []byte, opts ...Option) []byte {
+	r := NewHTMLRenderer(HTMLRendererParameters{
+		Flags: CommonHTMLFlags,
+	})
+	optList := []Option{WithRenderer(r), WithExtensions(CommonExtensions)}
+	optList = append(optList, opts...)
+	parser := New(optList...)
+	ast := parser.Parse(input)
+	var buf bytes.Buffer
+	parser.renderer.RenderHeader(&buf, ast)
+	ast.Walk(func(node *Node, entering bool) WalkStatus {
+		return parser.renderer.RenderNode(&buf, node, entering)
+	})
+	parser.renderer.RenderFooter(&buf, ast)
+	return buf.Bytes()
+}
+
+// Parse is an entry point to the parsing part of Blackfriday. It takes an
+// input markdown document and produces a syntax tree for its contents. This
+// tree can then be rendered with a default or custom renderer, or
+// analyzed/transformed by the caller to whatever non-standard needs they have.
+// The return value is the root node of the syntax tree.
+func (p *Markdown) Parse(input []byte) *Node {
+	p.block(input)
+	// Walk the tree and finish up some of unfinished blocks
+	for p.tip != nil {
+		p.finalize(p.tip)
+	}
+	// Walk the tree again and process inline markdown in each block
+	p.doc.Walk(func(node *Node, entering bool) WalkStatus {
+		if node.Type == Paragraph || node.Type == Heading || node.Type == TableCell {
+			p.inline(node, node.content)
+			node.content = nil
+		}
+		return GoToNext
+	})
+	p.parseRefsToAST()
+	return p.doc
+}
+
+func (p *Markdown) parseRefsToAST() {
+	if p.extensions&Footnotes == 0 || len(p.notes) == 0 {
+		return
+	}
+	p.tip = p.doc
+	block := p.addBlock(List, nil)
+	block.IsFootnotesList = true
+	block.ListFlags = ListTypeOrdered
+	flags := ListItemBeginningOfList
+	// Note: this loop is intentionally explicit, not range-form. This is
+	// because the body of the loop will append nested footnotes to p.notes and
+	// we need to process those late additions. Range form would only walk over
+	// the fixed initial set.
+	for i := 0; i < len(p.notes); i++ {
+		ref := p.notes[i]
+		p.addExistingChild(ref.footnote, 0)
+		block := ref.footnote
+		block.ListFlags = flags | ListTypeOrdered
+		block.RefLink = ref.link
+		if ref.hasBlock {
+			flags |= ListItemContainsBlock
+			p.block(ref.title)
+		} else {
+			p.inline(block, ref.title)
+		}
+		flags &^= ListItemBeginningOfList | ListItemContainsBlock
+	}
+	above := block.Parent
+	finalizeList(block)
+	p.tip = above
+	block.Walk(func(node *Node, entering bool) WalkStatus {
+		if node.Type == Paragraph || node.Type == Heading {
+			p.inline(node, node.content)
+			node.content = nil
+		}
+		return GoToNext
+	})
+}
+
+//
+// Link references
+//
+// This section implements support for references that (usually) appear
+// as footnotes in a document, and can be referenced anywhere in the document.
+// The basic format is:
+//
+//    [1]: http://www.google.com/ "Google"
+//    [2]: http://www.github.com/ "Github"
+//
+// Anywhere in the document, the reference can be linked by referring to its
+// label, i.e., 1 and 2 in this example, as in:
+//
+//    This library is hosted on [Github][2], a git hosting site.
+//
+// Actual footnotes as specified in Pandoc and supported by some other Markdown
+// libraries such as php-markdown are also taken care of. They look like this:
+//
+//    This sentence needs a bit of further explanation.[^note]
+//
+//    [^note]: This is the explanation.
+//
+// Footnotes should be placed at the end of the document in an ordered list.
+// Finally, there are inline footnotes such as:
+//
+//    Inline footnotes^[Also supported.] provide a quick inline explanation,
+//    but are rendered at the bottom of the document.
+//
+
+// reference holds all information necessary for a reference-style links or
+// footnotes.
+//
+// Consider this markdown with reference-style links:
+//
+//     [link][ref]
+//
+//     [ref]: /url/ "tooltip title"
+//
+// It will be ultimately converted to this HTML:
+//
+//     <p><a href=\"/url/\" title=\"title\">link</a></p>
+//
+// And a reference structure will be populated as follows:
+//
+//     p.refs["ref"] = &reference{
+//         link: "/url/",
+//         title: "tooltip title",
+//     }
+//
+// Alternatively, reference can contain information about a footnote. Consider
+// this markdown:
+//
+//     Text needing a footnote.[^a]
+//
+//     [^a]: This is the note
+//
+// A reference structure will be populated as follows:
+//
+//     p.refs["a"] = &reference{
+//         link: "a",
+//         title: "This is the note",
+//         noteID: <some positive int>,
+//     }
+//
+// TODO: As you can see, it begs for splitting into two dedicated structures
+// for refs and for footnotes.
+type reference struct {
+	link     []byte
+	title    []byte
+	noteID   int // 0 if not a footnote ref
+	hasBlock bool
+	footnote *Node // a link to the Item node within a list of footnotes
+
+	text []byte // only gets populated by refOverride feature with Reference.Text
+}
+
+func (r *reference) String() string {
+	return fmt.Sprintf("{link: %q, title: %q, text: %q, noteID: %d, hasBlock: %v}",
+		r.link, r.title, r.text, r.noteID, r.hasBlock)
+}
+
+// Check whether or not data starts with a reference link.
+// If so, it is parsed and stored in the list of references
+// (in the render struct).
+// Returns the number of bytes to skip to move past it,
+// or zero if the first line is not a reference.
+func isReference(p *Markdown, data []byte, tabSize int) int {
+	// up to 3 optional leading spaces
+	if len(data) < 4 {
+		return 0
+	}
+	i := 0
+	for i < 3 && data[i] == ' ' {
+		i++
+	}
+
+	noteID := 0
+
+	// id part: anything but a newline between brackets
+	if data[i] != '[' {
+		return 0
+	}
+	i++
+	if p.extensions&Footnotes != 0 {
+		if i < len(data) && data[i] == '^' {
+			// we can set it to anything here because the proper noteIds will
+			// be assigned later during the second pass. It just has to be != 0
+			noteID = 1
+			i++
+		}
+	}
+	idOffset := i
+	for i < len(data) && data[i] != '\n' && data[i] != '\r' && data[i] != ']' {
+		i++
+	}
+	if i >= len(data) || data[i] != ']' {
+		return 0
+	}
+	idEnd := i
+	// footnotes can have empty ID, like this: [^], but a reference can not be
+	// empty like this: []. Break early if it's not a footnote and there's no ID
+	if noteID == 0 && idOffset == idEnd {
+		return 0
+	}
+	// spacer: colon (space | tab)* newline? (space | tab)*
+	i++
+	if i >= len(data) || data[i] != ':' {
+		return 0
+	}
+	i++
+	for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+		i++
+	}
+	if i < len(data) && (data[i] == '\n' || data[i] == '\r') {
+		i++
+		if i < len(data) && data[i] == '\n' && data[i-1] == '\r' {
+			i++
+		}
+	}
+	for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+		i++
+	}
+	if i >= len(data) {
+		return 0
+	}
+
+	var (
+		linkOffset, linkEnd   int
+		titleOffset, titleEnd int
+		lineEnd               int
+		raw                   []byte
+		hasBlock              bool
+	)
+
+	if p.extensions&Footnotes != 0 && noteID != 0 {
+		linkOffset, linkEnd, raw, hasBlock = scanFootnote(p, data, i, tabSize)
+		lineEnd = linkEnd
+	} else {
+		linkOffset, linkEnd, titleOffset, titleEnd, lineEnd = scanLinkRef(p, data, i)
+	}
+	if lineEnd == 0 {
+		return 0
+	}
+
+	// a valid ref has been found
+
+	ref := &reference{
+		noteID:   noteID,
+		hasBlock: hasBlock,
+	}
+
+	if noteID > 0 {
+		// reusing the link field for the id since footnotes don't have links
+		ref.link = data[idOffset:idEnd]
+		// if footnote, it's not really a title, it's the contained text
+		ref.title = raw
+	} else {
+		ref.link = data[linkOffset:linkEnd]
+		ref.title = data[titleOffset:titleEnd]
+	}
+
+	// id matches are case-insensitive
+	id := string(bytes.ToLower(data[idOffset:idEnd]))
+
+	p.refs[id] = ref
+
+	return lineEnd
+}
+
+func scanLinkRef(p *Markdown, data []byte, i int) (linkOffset, linkEnd, titleOffset, titleEnd, lineEnd int) {
+	// link: whitespace-free sequence, optionally between angle brackets
+	if data[i] == '<' {
+		i++
+	}
+	linkOffset = i
+	for i < len(data) && data[i] != ' ' && data[i] != '\t' && data[i] != '\n' && data[i] != '\r' {
+		i++
+	}
+	linkEnd = i
+	if data[linkOffset] == '<' && data[linkEnd-1] == '>' {
+		linkOffset++
+		linkEnd--
+	}
+
+	// optional spacer: (space | tab)* (newline | '\'' | '"' | '(' )
+	for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+		i++
+	}
+	if i < len(data) && data[i] != '\n' && data[i] != '\r' && data[i] != '\'' && data[i] != '"' && data[i] != '(' {
+		return
+	}
+
+	// compute end-of-line
+	if i >= len(data) || data[i] == '\r' || data[i] == '\n' {
+		lineEnd = i
+	}
+	if i+1 < len(data) && data[i] == '\r' && data[i+1] == '\n' {
+		lineEnd++
+	}
+
+	// optional (space|tab)* spacer after a newline
+	if lineEnd > 0 {
+		i = lineEnd + 1
+		for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+			i++
+		}
+	}
+
+	// optional title: any non-newline sequence enclosed in '"() alone on its line
+	if i+1 < len(data) && (data[i] == '\'' || data[i] == '"' || data[i] == '(') {
+		i++
+		titleOffset = i
+
+		// look for EOL
+		for i < len(data) && data[i] != '\n' && data[i] != '\r' {
+			i++
+		}
+		if i+1 < len(data) && data[i] == '\n' && data[i+1] == '\r' {
+			titleEnd = i + 1
+		} else {
+			titleEnd = i
+		}
+
+		// step back
+		i--
+		for i > titleOffset && (data[i] == ' ' || data[i] == '\t') {
+			i--
+		}
+		if i > titleOffset && (data[i] == '\'' || data[i] == '"' || data[i] == ')') {
+			lineEnd = titleEnd
+			titleEnd = i
+		}
+	}
+
+	return
+}
+
+// The first bit of this logic is the same as Parser.listItem, but the rest
+// is much simpler. This function simply finds the entire block and shifts it
+// over by one tab if it is indeed a block (just returns the line if it's not).
+// blockEnd is the end of the section in the input buffer, and contents is the
+// extracted text that was shifted over one tab. It will need to be rendered at
+// the end of the document.
+func scanFootnote(p *Markdown, data []byte, i, indentSize int) (blockStart, blockEnd int, contents []byte, hasBlock bool) {
+	if i == 0 || len(data) == 0 {
+		return
+	}
+
+	// skip leading whitespace on first line
+	for i < len(data) && data[i] == ' ' {
+		i++
+	}
+
+	blockStart = i
+
+	// find the end of the line
+	blockEnd = i
+	for i < len(data) && data[i-1] != '\n' {
+		i++
+	}
+
+	// get working buffer
+	var raw bytes.Buffer
+
+	// put the first line into the working buffer
+	raw.Write(data[blockEnd:i])
+	blockEnd = i
+
+	// process the following lines
+	containsBlankLine := false
+
+gatherLines:
+	for blockEnd < len(data) {
+		i++
+
+		// find the end of this line
+		for i < len(data) && data[i-1] != '\n' {
+			i++
+		}
+
+		// if it is an empty line, guess that it is part of this item
+		// and move on to the next line
+		if p.isEmpty(data[blockEnd:i]) > 0 {
+			containsBlankLine = true
+			blockEnd = i
+			continue
+		}
+
+		n := 0
+		if n = isIndented(data[blockEnd:i], indentSize); n == 0 {
+			// this is the end of the block.
+			// we don't want to include this last line in the index.
+			break gatherLines
+		}
+
+		// if there were blank lines before this one, insert a new one now
+		if containsBlankLine {
+			raw.WriteByte('\n')
+			containsBlankLine = false
+		}
+
+		// get rid of that first tab, write to buffer
+		raw.Write(data[blockEnd+n : i])
+		hasBlock = true
+
+		blockEnd = i
+	}
+
+	if data[blockEnd-1] != '\n' {
+		raw.WriteByte('\n')
+	}
+
+	contents = raw.Bytes()
+
+	return
+}
+
+//
+//
+// Miscellaneous helper functions
+//
+//
+
+// Test if a character is a punctuation symbol.
+// Taken from a private function in regexp in the stdlib.
+func ispunct(c byte) bool {
+	for _, r := range []byte("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~") {
+		if c == r {
+			return true
+		}
+	}
+	return false
+}
+
+// Test if a character is a whitespace character.
+func isspace(c byte) bool {
+	return ishorizontalspace(c) || isverticalspace(c)
+}
+
+// Test if a character is a horizontal whitespace character.
+func ishorizontalspace(c byte) bool {
+	return c == ' ' || c == '\t'
+}
+
+// Test if a character is a vertical character.
+func isverticalspace(c byte) bool {
+	return c == '\n' || c == '\r' || c == '\f' || c == '\v'
+}
+
+// Test if a character is letter.
+func isletter(c byte) bool {
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
+}
+
+// Test if a character is a letter or a digit.
+// TODO: check when this is looking for ASCII alnum and when it should use unicode
+func isalnum(c byte) bool {
+	return (c >= '0' && c <= '9') || isletter(c)
+}
+
+// Replace tab characters with spaces, aligning to the next TAB_SIZE column.
+// always ends output with a newline
+func expandTabs(out *bytes.Buffer, line []byte, tabSize int) {
+	// first, check for common cases: no tabs, or only tabs at beginning of line
+	i, prefix := 0, 0
+	slowcase := false
+	for i = 0; i < len(line); i++ {
+		if line[i] == '\t' {
+			if prefix == i {
+				prefix++
+			} else {
+				slowcase = true
+				break
+			}
+		}
+	}
+
+	// no need to decode runes if all tabs are at the beginning of the line
+	if !slowcase {
+		for i = 0; i < prefix*tabSize; i++ {
+			out.WriteByte(' ')
+		}
+		out.Write(line[prefix:])
+		return
+	}
+
+	// the slow case: we need to count runes to figure out how
+	// many spaces to insert for each tab
+	column := 0
+	i = 0
+	for i < len(line) {
+		start := i
+		for i < len(line) && line[i] != '\t' {
+			_, size := utf8.DecodeRune(line[i:])
+			i += size
+			column++
+		}
+
+		if i > start {
+			out.Write(line[start:i])
+		}
+
+		if i >= len(line) {
+			break
+		}
+
+		for {
+			out.WriteByte(' ')
+			column++
+			if column%tabSize == 0 {
+				break
+			}
+		}
+
+		i++
+	}
+}
+
+// Find if a line counts as indented or not.
+// Returns number of characters the indent is (0 = not indented).
+func isIndented(data []byte, indentSize int) int {
+	if len(data) == 0 {
+		return 0
+	}
+	if data[0] == '\t' {
+		return 1
+	}
+	if len(data) < indentSize {
+		return 0
+	}
+	for i := 0; i < indentSize; i++ {
+		if data[i] != ' ' {
+			return 0
+		}
+	}
+	return indentSize
+}
+
+// Create a url-safe slug for fragments
+func slugify(in []byte) []byte {
+	if len(in) == 0 {
+		return in
+	}
+	out := make([]byte, 0, len(in))
+	sym := false
+
+	for _, ch := range in {
+		if isalnum(ch) {
+			sym = false
+			out = append(out, ch)
+		} else if sym {
+			continue
+		} else {
+			out = append(out, '-')
+			sym = true
+		}
+	}
+	var a, b int
+	var ch byte
+	for a, ch = range out {
+		if ch != '-' {
+			break
+		}
+	}
+	for b = len(out) - 1; b > 0; b-- {
+		if out[b] != '-' {
+			break
+		}
+	}
+	return out[a : b+1]
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/node.go b/test/tools/vendor/github.com/russross/blackfriday/v2/node.go
new file mode 100644
index 000000000..04e6050ce
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/node.go
@@ -0,0 +1,360 @@
+package blackfriday
+
+import (
+	"bytes"
+	"fmt"
+)
+
+// NodeType specifies a type of a single node of a syntax tree. Usually one
+// node (and its type) corresponds to a single markdown feature, e.g. emphasis
+// or code block.
+type NodeType int
+
+// Constants for identifying different types of nodes. See NodeType.
+const (
+	Document NodeType = iota
+	BlockQuote
+	List
+	Item
+	Paragraph
+	Heading
+	HorizontalRule
+	Emph
+	Strong
+	Del
+	Link
+	Image
+	Text
+	HTMLBlock
+	CodeBlock
+	Softbreak
+	Hardbreak
+	Code
+	HTMLSpan
+	Table
+	TableCell
+	TableHead
+	TableBody
+	TableRow
+)
+
+var nodeTypeNames = []string{
+	Document:       "Document",
+	BlockQuote:     "BlockQuote",
+	List:           "List",
+	Item:           "Item",
+	Paragraph:      "Paragraph",
+	Heading:        "Heading",
+	HorizontalRule: "HorizontalRule",
+	Emph:           "Emph",
+	Strong:         "Strong",
+	Del:            "Del",
+	Link:           "Link",
+	Image:          "Image",
+	Text:           "Text",
+	HTMLBlock:      "HTMLBlock",
+	CodeBlock:      "CodeBlock",
+	Softbreak:      "Softbreak",
+	Hardbreak:      "Hardbreak",
+	Code:           "Code",
+	HTMLSpan:       "HTMLSpan",
+	Table:          "Table",
+	TableCell:      "TableCell",
+	TableHead:      "TableHead",
+	TableBody:      "TableBody",
+	TableRow:       "TableRow",
+}
+
+func (t NodeType) String() string {
+	return nodeTypeNames[t]
+}
+
+// ListData contains fields relevant to a List and Item node type.
+type ListData struct {
+	ListFlags       ListType
+	Tight           bool   // Skip <p>s around list item data if true
+	BulletChar      byte   // '*', '+' or '-' in bullet lists
+	Delimiter       byte   // '.' or ')' after the number in ordered lists
+	RefLink         []byte // If not nil, turns this list item into a footnote item and triggers different rendering
+	IsFootnotesList bool   // This is a list of footnotes
+}
+
+// LinkData contains fields relevant to a Link node type.
+type LinkData struct {
+	Destination []byte // Destination is what goes into a href
+	Title       []byte // Title is the tooltip thing that goes in a title attribute
+	NoteID      int    // NoteID contains a serial number of a footnote, zero if it's not a footnote
+	Footnote    *Node  // If it's a footnote, this is a direct link to the footnote Node. Otherwise nil.
+}
+
+// CodeBlockData contains fields relevant to a CodeBlock node type.
+type CodeBlockData struct {
+	IsFenced    bool   // Specifies whether it's a fenced code block or an indented one
+	Info        []byte // This holds the info string
+	FenceChar   byte
+	FenceLength int
+	FenceOffset int
+}
+
+// TableCellData contains fields relevant to a TableCell node type.
+type TableCellData struct {
+	IsHeader bool           // This tells if it's under the header row
+	Align    CellAlignFlags // This holds the value for align attribute
+}
+
+// HeadingData contains fields relevant to a Heading node type.
+type HeadingData struct {
+	Level        int    // This holds the heading level number
+	HeadingID    string // This might hold heading ID, if present
+	IsTitleblock bool   // Specifies whether it's a title block
+}
+
+// Node is a single element in the abstract syntax tree of the parsed document.
+// It holds connections to the structurally neighboring nodes and, for certain
+// types of nodes, additional information that might be needed when rendering.
+type Node struct {
+	Type       NodeType // Determines the type of the node
+	Parent     *Node    // Points to the parent
+	FirstChild *Node    // Points to the first child, if any
+	LastChild  *Node    // Points to the last child, if any
+	Prev       *Node    // Previous sibling; nil if it's the first child
+	Next       *Node    // Next sibling; nil if it's the last child
+
+	Literal []byte // Text contents of the leaf nodes
+
+	HeadingData   // Populated if Type is Heading
+	ListData      // Populated if Type is List
+	CodeBlockData // Populated if Type is CodeBlock
+	LinkData      // Populated if Type is Link
+	TableCellData // Populated if Type is TableCell
+
+	content []byte // Markdown content of the block nodes
+	open    bool   // Specifies an open block node that has not been finished to process yet
+}
+
+// NewNode allocates a node of a specified type.
+func NewNode(typ NodeType) *Node {
+	return &Node{
+		Type: typ,
+		open: true,
+	}
+}
+
+func (n *Node) String() string {
+	ellipsis := ""
+	snippet := n.Literal
+	if len(snippet) > 16 {
+		snippet = snippet[:16]
+		ellipsis = "..."
+	}
+	return fmt.Sprintf("%s: '%s%s'", n.Type, snippet, ellipsis)
+}
+
+// Unlink removes node 'n' from the tree.
+// It panics if the node is nil.
+func (n *Node) Unlink() {
+	if n.Prev != nil {
+		n.Prev.Next = n.Next
+	} else if n.Parent != nil {
+		n.Parent.FirstChild = n.Next
+	}
+	if n.Next != nil {
+		n.Next.Prev = n.Prev
+	} else if n.Parent != nil {
+		n.Parent.LastChild = n.Prev
+	}
+	n.Parent = nil
+	n.Next = nil
+	n.Prev = nil
+}
+
+// AppendChild adds a node 'child' as a child of 'n'.
+// It panics if either node is nil.
+func (n *Node) AppendChild(child *Node) {
+	child.Unlink()
+	child.Parent = n
+	if n.LastChild != nil {
+		n.LastChild.Next = child
+		child.Prev = n.LastChild
+		n.LastChild = child
+	} else {
+		n.FirstChild = child
+		n.LastChild = child
+	}
+}
+
+// InsertBefore inserts 'sibling' immediately before 'n'.
+// It panics if either node is nil.
+func (n *Node) InsertBefore(sibling *Node) {
+	sibling.Unlink()
+	sibling.Prev = n.Prev
+	if sibling.Prev != nil {
+		sibling.Prev.Next = sibling
+	}
+	sibling.Next = n
+	n.Prev = sibling
+	sibling.Parent = n.Parent
+	if sibling.Prev == nil {
+		sibling.Parent.FirstChild = sibling
+	}
+}
+
+// IsContainer returns true if 'n' can contain children.
+func (n *Node) IsContainer() bool {
+	switch n.Type {
+	case Document:
+		fallthrough
+	case BlockQuote:
+		fallthrough
+	case List:
+		fallthrough
+	case Item:
+		fallthrough
+	case Paragraph:
+		fallthrough
+	case Heading:
+		fallthrough
+	case Emph:
+		fallthrough
+	case Strong:
+		fallthrough
+	case Del:
+		fallthrough
+	case Link:
+		fallthrough
+	case Image:
+		fallthrough
+	case Table:
+		fallthrough
+	case TableHead:
+		fallthrough
+	case TableBody:
+		fallthrough
+	case TableRow:
+		fallthrough
+	case TableCell:
+		return true
+	default:
+		return false
+	}
+}
+
+// IsLeaf returns true if 'n' is a leaf node.
+func (n *Node) IsLeaf() bool {
+	return !n.IsContainer()
+}
+
+func (n *Node) canContain(t NodeType) bool {
+	if n.Type == List {
+		return t == Item
+	}
+	if n.Type == Document || n.Type == BlockQuote || n.Type == Item {
+		return t != Item
+	}
+	if n.Type == Table {
+		return t == TableHead || t == TableBody
+	}
+	if n.Type == TableHead || n.Type == TableBody {
+		return t == TableRow
+	}
+	if n.Type == TableRow {
+		return t == TableCell
+	}
+	return false
+}
+
+// WalkStatus allows NodeVisitor to have some control over the tree traversal.
+// It is returned from NodeVisitor and different values allow Node.Walk to
+// decide which node to go to next.
+type WalkStatus int
+
+const (
+	// GoToNext is the default traversal of every node.
+	GoToNext WalkStatus = iota
+	// SkipChildren tells walker to skip all children of current node.
+	SkipChildren
+	// Terminate tells walker to terminate the traversal.
+	Terminate
+)
+
+// NodeVisitor is a callback to be called when traversing the syntax tree.
+// Called twice for every node: once with entering=true when the branch is
+// first visited, then with entering=false after all the children are done.
+type NodeVisitor func(node *Node, entering bool) WalkStatus
+
+// Walk is a convenience method that instantiates a walker and starts a
+// traversal of subtree rooted at n.
+func (n *Node) Walk(visitor NodeVisitor) {
+	w := newNodeWalker(n)
+	for w.current != nil {
+		status := visitor(w.current, w.entering)
+		switch status {
+		case GoToNext:
+			w.next()
+		case SkipChildren:
+			w.entering = false
+			w.next()
+		case Terminate:
+			return
+		}
+	}
+}
+
+type nodeWalker struct {
+	current  *Node
+	root     *Node
+	entering bool
+}
+
+func newNodeWalker(root *Node) *nodeWalker {
+	return &nodeWalker{
+		current:  root,
+		root:     root,
+		entering: true,
+	}
+}
+
+func (nw *nodeWalker) next() {
+	if (!nw.current.IsContainer() || !nw.entering) && nw.current == nw.root {
+		nw.current = nil
+		return
+	}
+	if nw.entering && nw.current.IsContainer() {
+		if nw.current.FirstChild != nil {
+			nw.current = nw.current.FirstChild
+			nw.entering = true
+		} else {
+			nw.entering = false
+		}
+	} else if nw.current.Next == nil {
+		nw.current = nw.current.Parent
+		nw.entering = false
+	} else {
+		nw.current = nw.current.Next
+		nw.entering = true
+	}
+}
+
+func dump(ast *Node) {
+	fmt.Println(dumpString(ast))
+}
+
+func dumpR(ast *Node, depth int) string {
+	if ast == nil {
+		return ""
+	}
+	indent := bytes.Repeat([]byte("\t"), depth)
+	content := ast.Literal
+	if content == nil {
+		content = ast.content
+	}
+	result := fmt.Sprintf("%s%s(%q)\n", indent, ast.Type, content)
+	for n := ast.FirstChild; n != nil; n = n.Next {
+		result += dumpR(n, depth+1)
+	}
+	return result
+}
+
+func dumpString(ast *Node) string {
+	return dumpR(ast, 0)
+}
diff --git a/test/tools/vendor/github.com/russross/blackfriday/v2/smartypants.go b/test/tools/vendor/github.com/russross/blackfriday/v2/smartypants.go
new file mode 100644
index 000000000..3a220e942
--- /dev/null
+++ b/test/tools/vendor/github.com/russross/blackfriday/v2/smartypants.go
@@ -0,0 +1,457 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+//
+// SmartyPants rendering
+//
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"io"
+)
+
+// SPRenderer is a struct containing state of a Smartypants renderer.
+type SPRenderer struct {
+	inSingleQuote bool
+	inDoubleQuote bool
+	callbacks     [256]smartCallback
+}
+
+func wordBoundary(c byte) bool {
+	return c == 0 || isspace(c) || ispunct(c)
+}
+
+func tolower(c byte) byte {
+	if c >= 'A' && c <= 'Z' {
+		return c - 'A' + 'a'
+	}
+	return c
+}
+
+func isdigit(c byte) bool {
+	return c >= '0' && c <= '9'
+}
+
+func smartQuoteHelper(out *bytes.Buffer, previousChar byte, nextChar byte, quote byte, isOpen *bool, addNBSP bool) bool {
+	// edge of the buffer is likely to be a tag that we don't get to see,
+	// so we treat it like text sometimes
+
+	// enumerate all sixteen possibilities for (previousChar, nextChar)
+	// each can be one of {0, space, punct, other}
+	switch {
+	case previousChar == 0 && nextChar == 0:
+		// context is not any help here, so toggle
+		*isOpen = !*isOpen
+	case isspace(previousChar) && nextChar == 0:
+		// [ "] might be [ "<code>foo...]
+		*isOpen = true
+	case ispunct(previousChar) && nextChar == 0:
+		// [!"] hmm... could be [Run!"] or [("<code>...]
+		*isOpen = false
+	case /* isnormal(previousChar) && */ nextChar == 0:
+		// [a"] is probably a close
+		*isOpen = false
+	case previousChar == 0 && isspace(nextChar):
+		// [" ] might be [...foo</code>" ]
+		*isOpen = false
+	case isspace(previousChar) && isspace(nextChar):
+		// [ " ] context is not any help here, so toggle
+		*isOpen = !*isOpen
+	case ispunct(previousChar) && isspace(nextChar):
+		// [!" ] is probably a close
+		*isOpen = false
+	case /* isnormal(previousChar) && */ isspace(nextChar):
+		// [a" ] this is one of the easy cases
+		*isOpen = false
+	case previousChar == 0 && ispunct(nextChar):
+		// ["!] hmm... could be ["$1.95] or [</code>"!...]
+		*isOpen = false
+	case isspace(previousChar) && ispunct(nextChar):
+		// [ "!] looks more like [ "$1.95]
+		*isOpen = true
+	case ispunct(previousChar) && ispunct(nextChar):
+		// [!"!] context is not any help here, so toggle
+		*isOpen = !*isOpen
+	case /* isnormal(previousChar) && */ ispunct(nextChar):
+		// [a"!] is probably a close
+		*isOpen = false
+	case previousChar == 0 /* && isnormal(nextChar) */ :
+		// ["a] is probably an open
+		*isOpen = true
+	case isspace(previousChar) /* && isnormal(nextChar) */ :
+		// [ "a] this is one of the easy cases
+		*isOpen = true
+	case ispunct(previousChar) /* && isnormal(nextChar) */ :
+		// [!"a] is probably an open
+		*isOpen = true
+	default:
+		// [a'b] maybe a contraction?
+		*isOpen = false
+	}
+
+	// Note that with the limited lookahead, this non-breaking
+	// space will also be appended to single double quotes.
+	if addNBSP && !*isOpen {
+		out.WriteString("&nbsp;")
+	}
+
+	out.WriteByte('&')
+	if *isOpen {
+		out.WriteByte('l')
+	} else {
+		out.WriteByte('r')
+	}
+	out.WriteByte(quote)
+	out.WriteString("quo;")
+
+	if addNBSP && *isOpen {
+		out.WriteString("&nbsp;")
+	}
+
+	return true
+}
+
+func (r *SPRenderer) smartSingleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 2 {
+		t1 := tolower(text[1])
+
+		if t1 == '\'' {
+			nextChar := byte(0)
+			if len(text) >= 3 {
+				nextChar = text[2]
+			}
+			if smartQuoteHelper(out, previousChar, nextChar, 'd', &r.inDoubleQuote, false) {
+				return 1
+			}
+		}
+
+		if (t1 == 's' || t1 == 't' || t1 == 'm' || t1 == 'd') && (len(text) < 3 || wordBoundary(text[2])) {
+			out.WriteString("&rsquo;")
+			return 0
+		}
+
+		if len(text) >= 3 {
+			t2 := tolower(text[2])
+
+			if ((t1 == 'r' && t2 == 'e') || (t1 == 'l' && t2 == 'l') || (t1 == 'v' && t2 == 'e')) &&
+				(len(text) < 4 || wordBoundary(text[3])) {
+				out.WriteString("&rsquo;")
+				return 0
+			}
+		}
+	}
+
+	nextChar := byte(0)
+	if len(text) > 1 {
+		nextChar = text[1]
+	}
+	if smartQuoteHelper(out, previousChar, nextChar, 's', &r.inSingleQuote, false) {
+		return 0
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartParens(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 3 {
+		t1 := tolower(text[1])
+		t2 := tolower(text[2])
+
+		if t1 == 'c' && t2 == ')' {
+			out.WriteString("&copy;")
+			return 2
+		}
+
+		if t1 == 'r' && t2 == ')' {
+			out.WriteString("&reg;")
+			return 2
+		}
+
+		if len(text) >= 4 && t1 == 't' && t2 == 'm' && text[3] == ')' {
+			out.WriteString("&trade;")
+			return 3
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartDash(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 2 {
+		if text[1] == '-' {
+			out.WriteString("&mdash;")
+			return 1
+		}
+
+		if wordBoundary(previousChar) && wordBoundary(text[1]) {
+			out.WriteString("&ndash;")
+			return 0
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartDashLatex(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 3 && text[1] == '-' && text[2] == '-' {
+		out.WriteString("&mdash;")
+		return 2
+	}
+	if len(text) >= 2 && text[1] == '-' {
+		out.WriteString("&ndash;")
+		return 1
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartAmpVariant(out *bytes.Buffer, previousChar byte, text []byte, quote byte, addNBSP bool) int {
+	if bytes.HasPrefix(text, []byte("&quot;")) {
+		nextChar := byte(0)
+		if len(text) >= 7 {
+			nextChar = text[6]
+		}
+		if smartQuoteHelper(out, previousChar, nextChar, quote, &r.inDoubleQuote, addNBSP) {
+			return 5
+		}
+	}
+
+	if bytes.HasPrefix(text, []byte("&#0;")) {
+		return 3
+	}
+
+	out.WriteByte('&')
+	return 0
+}
+
+func (r *SPRenderer) smartAmp(angledQuotes, addNBSP bool) func(*bytes.Buffer, byte, []byte) int {
+	var quote byte = 'd'
+	if angledQuotes {
+		quote = 'a'
+	}
+
+	return func(out *bytes.Buffer, previousChar byte, text []byte) int {
+		return r.smartAmpVariant(out, previousChar, text, quote, addNBSP)
+	}
+}
+
+func (r *SPRenderer) smartPeriod(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 3 && text[1] == '.' && text[2] == '.' {
+		out.WriteString("&hellip;")
+		return 2
+	}
+
+	if len(text) >= 5 && text[1] == ' ' && text[2] == '.' && text[3] == ' ' && text[4] == '.' {
+		out.WriteString("&hellip;")
+		return 4
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartBacktick(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 2 && text[1] == '`' {
+		nextChar := byte(0)
+		if len(text) >= 3 {
+			nextChar = text[2]
+		}
+		if smartQuoteHelper(out, previousChar, nextChar, 'd', &r.inDoubleQuote, false) {
+			return 1
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartNumberGeneric(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if wordBoundary(previousChar) && previousChar != '/' && len(text) >= 3 {
+		// is it of the form digits/digits(word boundary)?, i.e., \d+/\d+\b
+		// note: check for regular slash (/) or fraction slash (⁄, 0x2044, or 0xe2 81 84 in utf-8)
+		//       and avoid changing dates like 1/23/2005 into fractions.
+		numEnd := 0
+		for len(text) > numEnd && isdigit(text[numEnd]) {
+			numEnd++
+		}
+		if numEnd == 0 {
+			out.WriteByte(text[0])
+			return 0
+		}
+		denStart := numEnd + 1
+		if len(text) > numEnd+3 && text[numEnd] == 0xe2 && text[numEnd+1] == 0x81 && text[numEnd+2] == 0x84 {
+			denStart = numEnd + 3
+		} else if len(text) < numEnd+2 || text[numEnd] != '/' {
+			out.WriteByte(text[0])
+			return 0
+		}
+		denEnd := denStart
+		for len(text) > denEnd && isdigit(text[denEnd]) {
+			denEnd++
+		}
+		if denEnd == denStart {
+			out.WriteByte(text[0])
+			return 0
+		}
+		if len(text) == denEnd || wordBoundary(text[denEnd]) && text[denEnd] != '/' {
+			out.WriteString("<sup>")
+			out.Write(text[:numEnd])
+			out.WriteString("</sup>&frasl;<sub>")
+			out.Write(text[denStart:denEnd])
+			out.WriteString("</sub>")
+			return denEnd - 1
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartNumber(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if wordBoundary(previousChar) && previousChar != '/' && len(text) >= 3 {
+		if text[0] == '1' && text[1] == '/' && text[2] == '2' {
+			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' {
+				out.WriteString("&frac12;")
+				return 2
+			}
+		}
+
+		if text[0] == '1' && text[1] == '/' && text[2] == '4' {
+			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' || (len(text) >= 5 && tolower(text[3]) == 't' && tolower(text[4]) == 'h') {
+				out.WriteString("&frac14;")
+				return 2
+			}
+		}
+
+		if text[0] == '3' && text[1] == '/' && text[2] == '4' {
+			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' || (len(text) >= 6 && tolower(text[3]) == 't' && tolower(text[4]) == 'h' && tolower(text[5]) == 's') {
+				out.WriteString("&frac34;")
+				return 2
+			}
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartDoubleQuoteVariant(out *bytes.Buffer, previousChar byte, text []byte, quote byte) int {
+	nextChar := byte(0)
+	if len(text) > 1 {
+		nextChar = text[1]
+	}
+	if !smartQuoteHelper(out, previousChar, nextChar, quote, &r.inDoubleQuote, false) {
+		out.WriteString("&quot;")
+	}
+
+	return 0
+}
+
+func (r *SPRenderer) smartDoubleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+	return r.smartDoubleQuoteVariant(out, previousChar, text, 'd')
+}
+
+func (r *SPRenderer) smartAngledDoubleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+	return r.smartDoubleQuoteVariant(out, previousChar, text, 'a')
+}
+
+func (r *SPRenderer) smartLeftAngle(out *bytes.Buffer, previousChar byte, text []byte) int {
+	i := 0
+
+	for i < len(text) && text[i] != '>' {
+		i++
+	}
+
+	out.Write(text[:i+1])
+	return i
+}
+
+type smartCallback func(out *bytes.Buffer, previousChar byte, text []byte) int
+
+// NewSmartypantsRenderer constructs a Smartypants renderer object.
+func NewSmartypantsRenderer(flags HTMLFlags) *SPRenderer {
+	var (
+		r SPRenderer
+
+		smartAmpAngled      = r.smartAmp(true, false)
+		smartAmpAngledNBSP  = r.smartAmp(true, true)
+		smartAmpRegular     = r.smartAmp(false, false)
+		smartAmpRegularNBSP = r.smartAmp(false, true)
+
+		addNBSP = flags&SmartypantsQuotesNBSP != 0
+	)
+
+	if flags&SmartypantsAngledQuotes == 0 {
+		r.callbacks['"'] = r.smartDoubleQuote
+		if !addNBSP {
+			r.callbacks['&'] = smartAmpRegular
+		} else {
+			r.callbacks['&'] = smartAmpRegularNBSP
+		}
+	} else {
+		r.callbacks['"'] = r.smartAngledDoubleQuote
+		if !addNBSP {
+			r.callbacks['&'] = smartAmpAngled
+		} else {
+			r.callbacks['&'] = smartAmpAngledNBSP
+		}
+	}
+	r.callbacks['\''] = r.smartSingleQuote
+	r.callbacks['('] = r.smartParens
+	if flags&SmartypantsDashes != 0 {
+		if flags&SmartypantsLatexDashes == 0 {
+			r.callbacks['-'] = r.smartDash
+		} else {
+			r.callbacks['-'] = r.smartDashLatex
+		}
+	}
+	r.callbacks['.'] = r.smartPeriod
+	if flags&SmartypantsFractions == 0 {
+		r.callbacks['1'] = r.smartNumber
+		r.callbacks['3'] = r.smartNumber
+	} else {
+		for ch := '1'; ch <= '9'; ch++ {
+			r.callbacks[ch] = r.smartNumberGeneric
+		}
+	}
+	r.callbacks['<'] = r.smartLeftAngle
+	r.callbacks['`'] = r.smartBacktick
+	return &r
+}
+
+// Process is the entry point of the Smartypants renderer.
+func (r *SPRenderer) Process(w io.Writer, text []byte) {
+	mark := 0
+	for i := 0; i < len(text); i++ {
+		if action := r.callbacks[text[i]]; action != nil {
+			if i > mark {
+				w.Write(text[mark:i])
+			}
+			previousChar := byte(0)
+			if i > 0 {
+				previousChar = text[i-1]
+			}
+			var tmp bytes.Buffer
+			i += action(&tmp, previousChar, text[i:])
+			w.Write(tmp.Bytes())
+			mark = i + 1
+		}
+	}
+	if mark < len(text) {
+		w.Write(text[mark:])
+	}
+}