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diff --git a/files/zh-cn/web/api/customelementregistry/define/index.html b/files/zh-cn/web/api/customelementregistry/define/index.html
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@@ -0,0 +1,205 @@
+---
+title: CustomElementRegistry.define()
+slug: Web/API/CustomElementRegistry/define
+tags:
+  - API
+  - CustomElementRegistry
+  - Web Components
+  - custom elements
+translation_of: Web/API/CustomElementRegistry/define
+---
+<p>{{APIRef("CustomElementRegistry")}}</p>
+
+<p>{{domxref("CustomElementRegistry")}}接口的<code><strong>define()</strong></code>方法定义了一个自定义元素。</p>
+
+<p>你可以创建两种类型的自定义元素：</p>
+
+<ul>
+ <li><strong>自主定制元素</strong>：独立元素; 它们不会从内置HTML元素继承。</li>
+ <li><strong>自定义内置元素</strong>：这些元素继承自 - 并扩展 - 内置HTML元素</li>
+</ul>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">customElements.define(<em>name</em>, <em>constructor</em>, <em>options</em>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>name</dt>
+ <dd>自定义元素名.</dd>
+ <dt>constructor</dt>
+ <dd>自定义元素构造器.</dd>
+ <dt>options {{optional_inline}}</dt>
+ <dd>控制元素如何定义. 目前有一个选项支持:
+ <ul>
+  <li><code>extends</code>. 指定继承的已创建的元素. 被用于创建自定义元素.</li>
+ </ul>
+ </dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>空</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="自主定制元素">自主定制元素</h3>
+
+<p>以下代码取自我们的 <a href="https://github.com/mdn/web-components-examples/tree/master/popup-info-box-web-component">popup-info-box-web-component</a> 示例(<a href="https://mdn.github.io/web-components-examples/popup-info-box-web-component/">see it live also</a>)。</p>
+
+<pre class="brush: js">// Create a class for the element
+class PopUpInfo extends HTMLElement {
+  constructor() {
+    // Always call super first in constructor
+    super();
+
+    // Create a shadow root
+    var shadow = this.attachShadow({mode: 'open'});
+
+    // Create spans
+    var wrapper = document.createElement('span');
+    wrapper.setAttribute('class','wrapper');
+    var icon = document.createElement('span');
+    icon.setAttribute('class','icon');
+    icon.setAttribute('tabindex', 0);
+    var info = document.createElement('span');
+    info.setAttribute('class','info');
+
+    // Take attribute content and put it inside the info span
+    var text = this.getAttribute('text');
+    info.textContent = text;
+
+    // Insert icon
+    var imgUrl;
+    if(this.hasAttribute('img')) {
+      imgUrl = this.getAttribute('img');
+    } else {
+      imgUrl = 'img/default.png';
+    }
+    var img = document.createElement('img');
+    img.src = imgUrl;
+    icon.appendChild(img);
+
+    // Create some CSS to apply to the shadow dom
+    var style = document.createElement('style');
+
+    style.textContent = '.wrapper {' +
+                           'position: relative;' +
+                        '}' +
+
+                         '.info {' +
+                            'font-size: 0.8rem;' +
+                            'width: 200px;' +
+                            'display: inline-block;' +
+                            'border: 1px solid black;' +
+                            'padding: 10px;' +
+                            'background: white;' +
+                            'border-radius: 10px;' +
+                            'opacity: 0;' +
+                            'transition: 0.6s all;' +
+                            'position: absolute;' +
+                            'bottom: 20px;' +
+                            'left: 10px;' +
+                            'z-index: 3;' +
+                          '}' +
+
+                          'img {' +
+                            'width: 1.2rem' +
+                          '}' +
+
+                          '.icon:hover + .info, .icon:focus + .info {' +
+                            'opacity: 1;' +
+                          '}';
+
+    // attach the created elements to the shadow dom
+
+    shadow.appendChild(style);
+    shadow.appendChild(wrapper);
+    wrapper.appendChild(icon);
+    wrapper.appendChild(info);
+  }
+}
+
+// Define the new element
+customElements.define('popup-info', PopUpInfo);</pre>
+
+<pre><code>&lt;popup-info img="img/alt.png" text="Your card validation code (CVC) is an extra
+                                    security feature — it is the last 3 or 4
+                                    numbers on the back of your card."&gt;</code></pre>
+
+<div class="note">
+<p><strong>注意</strong>：自主自定义元素的构造函数必须扩展{{domxref("HTMLElement")}}。</p>
+</div>
+
+<h3 id="自定义内置元素">自定义内置元素</h3>
+
+<p>以下代码取自我们的 <a href="https://github.com/mdn/web-components-examples/tree/master/word-count-web-component">word-count-web-component</a> 实例 (<a href="https://mdn.github.io/web-components-examples/word-count-web-component/">查看实例效果</a>).</p>
+
+<pre class="brush: js">// Create a class for the element
+class WordCount extends HTMLParagraphElement {
+  constructor() {
+    // Always call super first in constructor
+    super();
+
+    // count words in element's parent element
+    var wcParent = this.parentNode;
+
+    function countWords(node){
+      var text = node.innerText || node.textContent
+      return text.split(/\s+/g).length;
+    }
+
+    var count = 'Words: ' + countWords(wcParent);
+
+    // Create a shadow root
+    var shadow = this.attachShadow({mode: 'open'});
+
+    // Create text node and add word count to it
+    var text = document.createElement('span');
+    text.textContent = count;
+
+    // Append it to the shadow root
+    shadow.appendChild(text);
+
+
+    // Update count when element content changes
+    setInterval(function() {
+      var count = 'Words: ' + countWords(wcParent);
+      text.textContent = count;
+    }, 200)
+
+  }
+}
+
+// Define the new element
+customElements.define('word-count', WordCount, { extends: 'p' });</pre>
+
+<pre class="brush: html"><code>&lt;p is="word-count"&gt;&lt;/p&gt;</code>
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "custom-elements.html#dom-customelementregistry-define", "customElements.define()")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<div class="hidden">
+<p>The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+</div>
+
+<p>{{Compat("api.CustomElementRegistry.define")}}</p>
diff --git a/files/zh-cn/web/api/customelementregistry/get/index.html b/files/zh-cn/web/api/customelementregistry/get/index.html
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index 0000000000..5b6cb1b564
--- /dev/null
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@@ -0,0 +1,72 @@
+---
+title: CustomElementRegistry.get()
+slug: Web/API/CustomElementRegistry/get
+tags:
+  - CustomElementRegistry
+  - Experimental
+  - Web Components
+  - custom elements
+translation_of: Web/API/CustomElementRegistry/get
+---
+<p>{{APIRef("CustomElementRegistry")}}</p>
+
+<p><span class="seoSummary"> {{domxref("CustomElementRegistry")}} 的<code><strong>get()</strong></code>方法返回以前定义自定义元素的构造函数.</span></p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>constructor</em> = customElements.get(<em>name</em>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>name</dt>
+ <dd>你想要返回引用的构造函数的自定义元素的名字。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>指定名字的自定义元素的构造函数，如果没有使用该名称的自定义元素定义，则为<code>undefined</code>。</p>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">customElements.define('my-paragraph',
+  class extends HTMLElement {
+    constructor() {
+      super();
+      let template = document.getElementById('my-paragraph');
+      let templateContent = template.content;
+
+      const shadowRoot = this.attachShadow({mode: 'open'})
+        .appendChild(templateContent.cloneNode(true));
+  }
+})
+
+// Return a reference to the my-paragraph constructor
+<span class="message-body-wrapper"><span class="message-flex-body"><span class="devtools-monospace message-body">let ctor = customElements.get('my-paragraph');</span></span></span>
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "custom-elements.html#dom-customelementregistry-get", "customElements.get()")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.CustomElementRegistry.get")}}</p>
+</div>
diff --git a/files/zh-cn/web/api/customelementregistry/index.html b/files/zh-cn/web/api/customelementregistry/index.html
new file mode 100644
index 0000000000..4a2279fbdf
--- /dev/null
+++ b/files/zh-cn/web/api/customelementregistry/index.html
@@ -0,0 +1,92 @@
+---
+title: CustomElementRegistry
+slug: Web/API/CustomElementRegistry
+tags:
+  - API
+  - CustomElementRegistry
+  - Interface
+  - Web Components
+translation_of: Web/API/CustomElementRegistry
+---
+<div>{{DefaultAPISidebar("Web Components")}}</div>
+
+<p><strong><code>CustomElementRegistry</code></strong>接口提供注册自定义元素和查询已注册元素的方法。要获取它的实例，请使用 {{domxref("window.customElements")}}属性。</p>
+
+<h2 id="方法">方法</h2>
+
+<dl>
+ <dt>{{domxref("CustomElementRegistry.define()")}}</dt>
+ <dd>定义一个新的<a href="/zh-CN/docs/Web/Web_Components/Custom_Elements">自定义元素</a>。</dd>
+ <dt>{{domxref("CustomElementRegistry.get()")}}</dt>
+ <dd>返回指定自定义元素的构造函数，如果未定义自定义元素，则返回<code>undefined</code>。</dd>
+ <dt>{{domxref("CustomElementRegistry.upgrade()")}}</dt>
+ <dd>Upgrades a custom element directly, even before it is connected to its shadow root.</dd>
+ <dt>{{domxref("CustomElementRegistry.whenDefined()")}}</dt>
+ <dd>返回当使用给定名称定义自定义元素时将会执行的 {{jsxref("Promise", "promise")}}。（如果已经定义了这样一个自定义元素，那么立即执行返回的 promise。）</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<p>以下代码来自我们的 <a href="https://github.com/mdn/web-components-examples/tree/master/word-count-web-component">word-count-web-component</a> 示例（<a href="https://mdn.github.io/web-components-examples/word-count-web-component/">see it live also</a>）。 请注意我们如何使用 {{domxref("CustomElementRegistry.define()")}} 方法在创建其类后定义自定义元素。</p>
+
+<pre class="brush: js">// Create a class for the element
+class WordCount extends HTMLParagraphElement {
+  constructor() {
+    // Always call super first in constructor
+    super();
+
+    // count words in element's parent element
+    var wcParent = this.parentNode;
+
+    function countWords(node){
+      var text = node.innerText || node.textContent
+      return text.split(/\s+/g).length;
+    }
+
+    var count = 'Words: ' + countWords(wcParent);
+
+    // Create a shadow root
+    var shadow = this.attachShadow({mode: 'open'});
+
+    // Create text node and add word count to it
+    var text = document.createElement('span');
+    text.textContent = count;
+
+    // Append it to the shadow root
+    shadow.appendChild(text);
+
+
+    // Update count when element content changes
+    setInterval(function() {
+      var count = 'Words: ' + countWords(wcParent);
+      text.textContent = count;
+    }, 200)
+
+  }
+}
+
+// Define the new element
+customElements.define('word-count', WordCount, { extends: 'p' });</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "custom-elements.html#customelementregistry", "CustomElementRegistry")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.CustomElementRegistry")}}</p>
diff --git a/files/zh-cn/web/api/customelementregistry/upgrade/index.html b/files/zh-cn/web/api/customelementregistry/upgrade/index.html
new file mode 100644
index 0000000000..412485c9d6
--- /dev/null
+++ b/files/zh-cn/web/api/customelementregistry/upgrade/index.html
@@ -0,0 +1,64 @@
+---
+title: CustomElementRegistry.upgrade()
+slug: Web/API/CustomElementRegistry/upgrade
+translation_of: Web/API/CustomElementRegistry/upgrade
+---
+<p>{{APIRef("CustomElementRegistry")}}</p>
+
+<p>CustomElementRegistry接口的upgrade()方法将更新节点子树中所有包含阴影的自定义元素，甚至在它们连接到主文档之前也是如此。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">customElements.upgrade(<em>root</em>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>root</code></dt>
+ <dd>待升级的包含阴影的派生元素<code>节点</code> 。如果没有可升级的派生实例，则不会抛出异常。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>空.</p>
+
+<h2 id="示例">示例</h2>
+
+<p>摘至<a href="https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-upgrade">HTML 规范</a>:</p>
+
+<pre class="brush: js">const el = document.createElement("spider-man");
+
+class SpiderMan extends HTMLElement {}
+customElements.define("spider-man", SpiderMan);
+
+console.assert(!(el instanceof SpiderMan)); // not yet upgraded
+
+customElements.upgrade(el);
+console.assert(el instanceof SpiderMan);    // upgraded!
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "custom-elements.html#dom-customelementregistry-upgrade", "customElements.upgrade()")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</h2>
+
+<div>
+
+
+<p>{{Compat("api.CustomElementRegistry.upgrade")}}</p>
+</div>
diff --git a/files/zh-cn/web/api/customelementregistry/whendefined/index.html b/files/zh-cn/web/api/customelementregistry/whendefined/index.html
new file mode 100644
index 0000000000..8c5452386d
--- /dev/null
+++ b/files/zh-cn/web/api/customelementregistry/whendefined/index.html
@@ -0,0 +1,100 @@
+---
+title: CustomElementRegistry.whenDefined()
+slug: Web/API/CustomElementRegistry/whenDefined
+translation_of: Web/API/CustomElementRegistry/whenDefined
+---
+<p>{{APIRef("CustomElementRegistry")}}</p>
+
+<p><span class="seoSummary"> 当一个元素被定义时{{domxref("CustomElementRegistry")}} 中的方法<code><strong>whenDefined()</strong></code> 接口返回  {{jsxref("Promise")}}.</span></p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Promise&lt;&gt; customElements.whenDefined(<em>name</em>);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>name</dt>
+ <dd>自定义元素的名称</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>当自定义元素被定义时一个{{jsxref("Promise")}} 返回{jsxref("undefined")}}. 如果自定义元素已经被定义，则resolve立即执行。</p>
+
+<dl>
+</dl>
+
+<h3 id="例外">例外</h3>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Exception</th>
+   <th scope="col">Description</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>SyntaxError</code></td>
+   <td>如果提供的 <strong>name</strong> 不是一个有效的 <a href="https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name">自定义元素名字</a>, promise 的 reject 回调会接收到一个 <code>SyntaxError</code>.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="例子">例子</h2>
+
+<p><code><font face="Open Sans, arial, x-locale-body, sans-serif"><span style="background-color: #ffffff;">这个例子使用</span></font>whenDefined()</code> 来检测生成菜单的自定义元素何时被定义. 这个菜单显示占位符内容一直到菜单内容已经准备好显示.</p>
+
+<pre class="brush: html">&lt;nav id="menu-container"&gt;
+  &lt;div class="menu-placeholder"&gt;Loading...&lt;/div&gt;
+  &lt;nav-menu&gt;
+    &lt;menu-item&gt;Item 1&lt;/menu-item&gt;
+    &lt;menu-item&gt;Item 2&lt;/menu-item&gt;
+     ...
+    &lt;menu-item&gt;Item N&lt;/menu-item&gt;
+  &lt;/nav-menu&gt;
+&lt;/nav&gt;
+</pre>
+
+<pre class="brush: js">const container = document.getElementById('menu-container');
+const placeholder = container.querySelector('.menu-placeholder');
+// Fetch all the children of menu that are not yet defined.
+const undefinedElements = container.querySelectorAll(':not(:defined)');
+
+const promises = [...undefinedElements].map(
+  button =&gt; customElements.whenDefined(button.localName)
+);
+
+// Wait for all the children to be upgraded,
+// then remove the placeholder.
+await Promise.all(promises);
+container.removeChild(placeholder);
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "custom-elements.html#dom-customelementregistry-define", "customElements.whenDefined()")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+<div>
+
+
+<p>{{Compat("api.CustomElementRegistry.whenDefined")}}</p>
+</div>
+</div>