<hgroup> element代表文档章节所属的多级别的目录，它将多个<h1>至<h6>的子元素组装到一起。| Content categories | Flow content, heading content, palpable content. |
|---|---|
| Permitted content | One or more {{HTMLElement("h1")}}, {{HTMLElement("h2")}}, {{HTMLElement("h3")}}, {{HTMLElement("h4")}}, {{HTMLElement("h5")}}, and/or {{HTMLElement("h6")}}. |
| Tag omission | {{no_tag_omission}} |
| Permitted parent elements | Any element that accepts flow content. |
| Permitted ARIA roles | {{ARIARole("tab")}}, {{ARIARole("presentation")}} |
| DOM interface | {{domxref("HTMLElement")}} |
这个元素仅包含全局属性。
注意: 本元素已经从HTML5（W3C）规范中删除，但是它仍旧在 WHATWG 的 HTML 版本里。大多数浏览器都部分地实现，所以它不太可能消失。
然而，考虑到<hgroup>元素的一个关键存在目标是明确HTML规范中如何显示标题的轮廓算法，但因为其轮廓算法(outline algorithm)未在任何浏览器中实现，因此 <hgroup> 语义仍旧是理论上的建议。
HTML5 (W3C) 规范提供了如何标记副标题，小标题，可选标题和标语（Subheadings, subtitles, alternative titles and taglines）的建议。
The <hgroup> element allows the primary heading for a document section to be grouped with any secondary headings—such as subheadings or alternative titles—to form a multi-level heading.
In other words, the <hgroup> element prevents any of its secondary <h1>–<h6> children from creating separate sections of their own in the outline—as those <h1>–<h6> elements otherwise normally would if they were not children of any <hgroup>.
So in the abstract outline produced by the HTML outline algorithm defined in the HTML specification, the <hgroup> as a whole forms a single logical heading, with the entire set of <h1>–<h6> children of the <hgroup> going into the outline as one multi-level unit, to comprise that single logical heading in the abstract outline.
To produce any (non-abstract) rendered view of such an outline, some choice must be made in the design of the rendering tool about how to render <hgroup> headings in such a way as to convey their multi-level nature. There are a variety of ways an <hgroup> might be shown in a rendered outline; for example:
<hgroup> might be shown in a rendered outline in with a colon character and space (“: ”) or other such punctuation after the primary heading and before the first secondary heading (and with the same or similar punctuation before any other secondary headings<hgroup> might be shown in a rendered outline in with the primary heading followed by parentheses around the secondary heading(s)Consider the following HTML document:
<!DOCTYPE html>
<title>HTML Standard</title>
<body>
<hgroup id="document-title">
<h1>HTML</h1>
<h2>Living Standard — Last Updated 12 August 2016</h2>
</hgroup>
<p>Some intro to the document.</p>
<h2>Table of contents</h2>
<ol id=toc>...</ol>
<h2>First section</h2>
<p>Some intro to the first section.</p>
</body>
A rendered outline for that document might look like the following:
That is, the rendered outline might show the primary title, HTML, followed by a colon and space, followed by the secondary title, Living Standard — Last Updated 12 August 2016.
Or, the rendered outline for that document might instead look like the following:
That is, the rendered outline might show the primary title, HTML, followed by the secondary title shown in parentheses: (Living Standard — Last Updated 12 August 2016).
<hgroup> <h1>Main title</h1> <h2>Secondary title</h2> </hgroup>
{{CompatibilityTable}}
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 5 | {{CompatGeckoDesktop("2.0")}} | 9.0 | 11.10 | 4.1 |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | 2.2 | {{CompatGeckoMobile("2.0")}} | 9.0 | 11.0 | 5.0 |