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• 属性
• 范例
• 规范
• 浏览器兼容性
• 相关话题

HTML <meta> element 表示 metadata that cannot be represented by other HTML meta-related elements, like <base> , <link> , <script> , <style> or <title> .

The type of metadata provided by the meta element can be one of the following:

• 若 name attribute is set, the meta element provides document-level metadata , applying to the whole page.
• 若 http-equiv attribute is set, the meta element is a pragma directive , providing information equivalent to what can be given by a similarly-named HTTP header.
• 若 charset attribute is set, the meta element is a charset declaration , giving the character encoding in which the document is encoded.
• 若 itemprop attribute is set, the meta element provides user-defined metadata .

属性

此元素包括 全局属性 .

注意： the attribute name has a specific meaning for the <meta> element, and the itemprop attribute must not be set on the same <meta> element that has any existing name , http-equiv or charset 属性。

charset

This attribute declares the document's character encoding. If the attribute is present, its value must be an ASCII case-insensitive match for the string " utf-8 ", because UTF-8 is the only valid encoding for HTML5 documents. meta elements which declare a character encoding must be located entirely within the first 1024 bytes of the document.

content

This attribute contains the value for the http-equiv or name attribute, depending on which is used.

http-equiv

Defines a pragma directive. The attribute is named http-equiv (alent) because all the allowed values are names of particular HTTP headers:

• content-security-policy

  Allows page authors to define a content policy for the current page. Content policies mostly specify allowed server origins and script endpoints which help guard against cross-site scripting attacks.

• content-type

  Declares the MIME 类型 and character encoding of the document. If specified, the content attribute must have the value " text/html; charset=utf-8 ". This is equivalent to a meta element with the charset attribute specified, and carries the same restriction on placement within the document. 注意： Can only be used in documents served with a text/html — not in documents served with an XML MIME type.

• default-style

  Sets the name of the default CSS style sheet set.

• x-ua-compatible

  If specified, the content attribute must have the value " IE=edge ". User agents are required to ignore this pragma.

• refresh

  This instruction specifies:

  • The number of seconds until the page should be reloaded - only if the content attribute contains a positive integer.
  • The number of seconds until the page should redirect to another - only if the content attribute contains a positive integer followed by the string ' ;url= ', and a valid URL.

  可访问性关注

  Pages set with a refresh value run the risk of having the time interval being too short. People navigating with the aid of assistive technology such as a screen reader may be unable to read through and understand the page's content before being automatically redirected. The abrupt, unannounced updating of the page content may also be disorienting for people experiencing low vision conditions.

  • MDN Understanding WCAG, Guideline 2.1 explanations
  • MDN Understanding WCAG, Guideline 3.1 explanations
  • Understanding Success Criterion 2.2.1 | W3C Understanding WCAG 2.0
  • Understanding Success Criterion 2.2.4 | W3C Understanding WCAG 2.0
  • Understanding Success Criterion 3.2.5 | W3C Understanding WCAG 2.0

名称

名称 and content attributes can be used together to provide document metadata in terms of name-value pairs, with the 名称 attribute giving the metadata name, and the content attribute giving the value.

见 standard metadata names for details about the set of standard metadata names defined in the HTML specification.

范例

<meta charset="utf-8">
<!-- Redirect page after 3 seconds -->
<meta http-equiv="refresh" content="3;url=https://www.mozilla.org">
						

规范

规范	状态	注释
HTML 实时标准 The definition of '<meta>' in that specification.	实时标准

浏览器兼容性

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
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
meta	Chrome 完整支持 Yes	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 Yes	Opera 完整支持 Yes	Safari 完整支持 Yes	WebView Android 完整支持 Yes	Chrome Android 完整支持 Yes	Firefox Android 完整支持 4	Opera Android 完整支持 Yes	Safari iOS 完整支持 Yes	Samsung Internet Android 完整支持 Yes
charset	Chrome 完整支持 Yes	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 Yes	Opera 完整支持 Yes	Safari 完整支持 Yes	WebView Android 完整支持 Yes	Chrome Android 完整支持 Yes	Firefox Android 完整支持 4	Opera Android 完整支持 Yes	Safari iOS 完整支持 Yes	Samsung Internet Android 完整支持 Yes
content	Chrome 完整支持 Yes	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 Yes	Opera 完整支持 Yes	Safari 完整支持 Yes	WebView Android 完整支持 Yes	Chrome Android 完整支持 Yes	Firefox Android 完整支持 4	Opera Android 完整支持 Yes	Safari iOS 完整支持 Yes	Samsung Internet Android 完整支持 Yes
http-equiv	Chrome 完整支持 Yes	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 Yes	Opera 完整支持 Yes	Safari 完整支持 Yes	WebView Android 完整支持 Yes	Chrome Android 完整支持 Yes	Firefox Android 完整支持 4	Opera Android 完整支持 Yes	Safari iOS 完整支持 Yes	Samsung Internet Android 完整支持 Yes
名称	Chrome 完整支持 Yes	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 Yes	Opera 完整支持 Yes	Safari 完整支持 Yes	WebView Android 完整支持 Yes	Chrome Android 完整支持 Yes	Firefox Android 完整支持 4	Opera Android 完整支持 Yes	Safari iOS 完整支持 Yes	Samsung Internet Android 完整支持 Yes

图例

完整支持

完整支持

元数据

• 最后修改： Sep 3, 2020

相关话题

1. <base>
2. <head>
3. <link>
4. <meta>
5. <style>
6. <title>
7. HTML 元素

   1. A
      1. <a>
      2. <abbr>
      3. <acronym>
      4. <address>
      5. <applet>
      6. <area>
      7. <article>
      8. <aside>
      9. <audio>
   2. B
      1. <b>
      2. <base>
      3. <basefont>
      4. <bdi>
      5. <bdo>
      6. <bgsound>
      7. <big>
      8. <blink>
      9. <blockquote>
      10. <body>
      11. <br>
      12. <button>
   3. C
      1. <canvas>
      2. <caption>
      3. <center>
      4. <cite>
      5. <code>
      6. <col>
      7. <colgroup>
      8. <content>
   4. D
      1. <data>
      2. <datalist>
      3. <dd>
      4. <del>
      5. <details>
      6. <dfn>
      7. <dialog>
      8. <dir>
      9. <div>
      10. <dl>
      11. <dt>
   5. E
      1. <em>
      2. <embed>
   6. F
      1. <fieldset>
      2. <figcaption>
      3. <figure>
      4. <font>
      5. <footer>
      6. <form>
      7. <frame>
      8. <frameset>
   7. G H
      1. <h1>
      2. <h2>
      3. <h3>
      4. <h4>
      5. <h5>
      6. <h6>
      7. <head>
      8. <header>
      9. <hgroup>
      10. <hr>
      11. <html>
   8. I
      1. <i>
      2. <iframe>
      3. <img>
      4. <input>
      5. <ins>
      6. <isindex>
   9. J K
      1. <kbd>
      2. <keygen>
   10. L
       1. <label>
       2. <legend>
       3. <li>
       4. <link>
       5. <listing>
   11. M
       1. <main>
       2. <map>
       3. <mark>
       4. <marquee>
       5. <menu>
       6. <menuitem>
       7. <meta>
       8. <meter>
   12. N
       1. <nav>
       2. <nobr>
       3. <noframes>
       4. <noscript>
   13. O
       1. <object>
       2. <ol>
       3. <optgroup>
       4. <option>
       5. <output>
   14. P
       1. <p>
       2. <param>
       3. <picture>
       4. <plaintext>
       5. <pre>
       6. <progress>
   15. Q
       1. <q>
   16. R
       1. <rp>
       2. <rt>
       3. <rtc>
       4. <ruby>
   17. S
       1. <s>
       2. <samp>
       3. <script>
       4. <section>
       5. <select>
       6. <shadow>
       7. <slot>
       8. <small>
       9. <source>
       10. <spacer>
       11. <span>
       12. <strike>
       13. <strong>
       14. <style>
       15. <sub>
       16. <summary>
       17. <sup>
   18. T
       1. <table>
       2. <tbody>
       3. <td>
       4. <template>
       5. <textarea>
       6. <tfoot>
       7. <th>
       8. <thead>
       9. <time>
       10. <title>
       11. <tr>
       12. <track>
       13. <tt>
   19. U
       1. <u>
       2. <ul>
   20. V
       1. <var>
       2. <video>
   21. W
       1. <wbr>
   22. X Y Z
       1. <xmp>