HTML
<main>
element
represents the dominant content of the
<body>
of a document. The main content area consists of content that is directly related to or expands upon the central topic of a document, or the central functionality of an application.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
A document mustn't have more than one
<main>
element that doesn't have the
hidden
attribute specified.
| 内容类别 | 流内容 ，可触及内容。 |
|---|---|
| 准许内容 | 流内容 . |
| Tag omission | None; both the starting and ending tags are mandatory. |
| Permitted parents |
Where
flow content
is expected, but only if it is a
hierarchically correct
main
element
.
|
| Implicit ARIA role |
main
|
| Permitted ARIA roles |
No
role
permitted
|
| DOM 接口 |
HTMLElement
|
此元素只包括 全局属性 .
The content of a
<main>
element should be unique to the document. Content that is repeated across a set of documents or document sections such as sidebars, navigation links, copyright information, site logos, and search forms shouldn't be included unless the search form is the main function of the page.
<main>
doesn't contribute to the document's outline; that is, unlike elements such as
<body>
, headings such as
<h2>
, and such,
<main>
doesn't affect the
DOM's
concept of the structure of the page. It's strictly informative.
<!-- other content -->
<main>
<h1>Apples</h1>
<p>The apple is the pomaceous fruit of the apple tree.</p>
<article>
<h2>Red Delicious</h2>
<p>These bright red apples are the most common found in many
supermarkets.</p>
<p>... </p>
<p>... </p>
</article>
<article>
<h2>Granny Smith</h2>
<p>These juicy, green apples make a great filling for
apple pies.</p>
<p>... </p>
<p>... </p>
</article>
</main>
<!-- other content -->
<main>
element behaves like a
main
landmark
角色。
Landmarks
can be used by assistive technology to quickly identify and navigate to large sections of the document. Prefer using the
<main>
element over declaring
role="main"
, unless there are
legacy browser support concerns
.
Skip navigation, also known as "skipnav", is a technique that allows an assistive technology user to quickly bypass large sections of repeated content (main navigation, info banners, etc.). This lets the user access the main content of the page faster.
Adding an
id
属性到
<main>
element lets it be a target of a skip navigation link.
<body> <a href="#main-content">Skip to main content</a> <!-- navigation and header content --> <main id="main-content"> <!-- main page content --> </main> </body>
Browser reader mode functionality looks for the presence of the
<main>
element, as well as
heading
and
content sectioning elements
when converting content into a specialized reader view.
<main>
element is widely supported. For Internet Explorer 11 and lower, it's suggested that an
ARIA
role of
"main"
be added to the
<main>
element to ensure it is accessible (screen readers like JAWS, used in combination with older versions of Internet Explorer, understand the semantic meaning of the
<main>
element when this
role
attribute is included).
<main role="main"> ... </main>The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
main
|
Chrome 完整支持 26 | Edge 完整支持 12 | Firefox 完整支持 21 | IE 不支持 No | Opera 完整支持 16 | Safari 完整支持 7 | WebView Android 完整支持 Yes | Chrome Android 完整支持 Yes | Firefox Android 完整支持 21 | Opera Android 完整支持 Yes | Safari iOS 完整支持 7 | Samsung Internet Android 完整支持 Yes |
完整支持
不支持
<html>
,
<head>
,
<body>
<article>
,
<aside>
,
<footer>
,
<header>
，或
<nav>