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  3. HTML 元素参考
  4. <iframe>: The Inline Frame element

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HTML 内联框架元素 ( <iframe> ) 表示嵌套 浏览上下文 ，将另一 HTML 页面嵌入当前页面。

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.

Each embedded browsing context has its own 会话历史 and document . The browsing context that embeds the others is called the parent 浏览上下文 。 topmost browsing context — the one with no parent — is usually the browser window, represented by the Window 对象。

Because each browsing context is a complete document environment, every <iframe> in a page requires increased memory and other computing resources. While theoretically you can use as many <iframe> s as you like, check for performance problems.

内容类别 流内容 , 措词内容 , embedded content, interactive content, palpable content.
准许内容 None.
Tag omission None, both the starting and ending tag are mandatory.
Permitted parents Any element that accepts embedded content.
Implicit ARIA role 无对应角色
Permitted ARIA roles application , document , img , none , presentation
DOM 接口 HTMLIFrameElement

属性

此元素包括 全局属性 .

allow
Specifies a feature policy 为 <iframe> . The policy defines what features are available to the <iframe> based on the origin of the request (e.g. access to the microphone, camera, battery, web-share API, etc.).

For more information and examples see: Using Feature Policy > The iframe allow attribute .
allowfullscreen
设为 true 若 <iframe> can activate fullscreen mode by calling the requestFullscreen() 方法。
This attribute is considered a legacy attribute and redefined as allow="fullscreen" .
allowpaymentrequest
设为 true if a cross-origin <iframe> should be allowed to invoke the 支付请求 API .
This attribute is considered a legacy attribute and redefined as allow="payment" .
csp
A Content Security Policy enforced for the embedded resource. See HTMLIFrameElement.csp 了解细节。
height
The height of the frame in CSS pixels. Default is 150 .
loading
Indicates how the browser should load the iframe:
  • eager : Load the iframe immediately, regardless if it is outside the visible viewport (this is the default value).
  • lazy : Defer loading of the iframe until it reaches a calculated distance from the viewport, as defined by the browser.
名称
A targetable name for the embedded browsing context. This can be used in the target 属性在 <a> , <form> ，或 <base> elements; the formtarget 属性在 <input> or <button> elements; or the windowName parameter in the window.open() 方法。
referrerpolicy
Indicates which referrer to send when fetching the frame's resource:
  • no-referrer ： Referer header will not be sent.
  • no-referrer-when-downgrade (default): The Referer header will not be sent to origin s without TLS ( HTTPS ).
  • origin : The sent referrer will be limited to the origin of the referring page: its scheme , host ，和 port .
  • origin-when-cross-origin : The referrer sent to other origins will be limited to the scheme, the host, and the port. Navigations on the same origin will still include the path.
  • same-origin : A referrer will be sent for same origin , but cross-origin requests will contain no referrer information.
  • strict-origin : Only send the origin of the document as the referrer when the protocol security level stays the same (HTTPS→HTTPS), but don't send it to a less secure destination (HTTPS→HTTP).
  • strict-origin-when-cross-origin : Send a full URL when performing a same-origin request, only send the origin when the protocol security level stays the same (HTTPS→HTTPS), and send no header to a less secure destination (HTTPS→HTTP).
  • unsafe-url : The referrer will include the origin and the path (but not the fragment , password ，或 username ). This value is unsafe , because it leaks origins and paths from TLS-protected resources to insecure origins.
sandbox
Applies extra restrictions to the content in the frame. The value of the attribute can either be empty to apply all restrictions, or space-separated tokens to lift particular restrictions:
  • allow-downloads-without-user-activation : Allows for downloads to occur without a gesture from the user.
  • allow-downloads : Allows for downloads to occur with a gesture from the user.
  • allow-forms : Allows the resource to submit forms. If this keyword is not used, form submission is blocked.
  • allow-modals : Lets the resource open modal windows .
  • allow-orientation-lock : Lets the resource lock the screen orientation .
  • allow-pointer-lock : Lets the resource use the 指针锁 API .
  • allow-popups : Allows popups (such as window.open() , target="_blank" ，或 showModalDialog() ). If this keyword is not used, the popup will silently fail to open.
  • allow-popups-to-escape-sandbox : Lets the sandboxed document open new windows without those windows inheriting the sandboxing. For example, this can safely sandbox an advertisement without forcing the same restrictions upon the page the ad links to.
  • allow-presentation : Lets the resource start a presentation session .
  • allow-same-origin : If this token is not used, the resource is treated as being from a special origin that always fails the same-origin policy .
  • allow-scripts : Lets the resource run scripts (but not create popup windows).
  • allow-storage-access-by-user-activation : Lets the resource request access to the parent's storage capabilities with the 存储访问 API .
  • allow-top-navigation : Lets the resource navigate the top-level browsing context (the one named _top ).
  • allow-top-navigation-by-user-activation : Lets the resource navigate the top-level browsing context, but only if initiated by a user gesture.
Notes about sandboxing:
  • When the embedded document has the same origin as the embedding page, it is strongly discouraged to use both allow-scripts and allow-same-origin , as that lets the embedded document remove the sandbox attribute — making it no more secure than not using the sandbox attribute at all.
  • Sandboxing is useless if the attacker can display content outside a sandboxed iframe — such as if the viewer opens the frame in a new tab. Such content should be also served from a separate origin to limit potential damage.
  • sandbox attribute is unsupported in Internet Explorer 9 and earlier.
src
The URL of the page to embed. Use a value of about:blank to embed an empty page that conforms to the same-origin policy . Also note that programatically removing an <iframe> 's src attribute (e.g. via Element.removeAttribute() ) causes about:blank to be loaded in the frame in Firefox (from version 65), Chromium-based browsers, and Safari/iOS.
srcdoc
Inline HTML to embed, overriding the src attribute. If a browser does not support the srcdoc attribute, it will fall back to the URL in the src 属性。
width
The width of the frame in CSS pixels. Default is 300 .

Deprecated attributes

These attributes are deprecated and may no longer be supported by all user agents. You should not use them in new content, and try to remove them from existing content.

align

The alignment of this element with respect to the surrounding context.

frameborder
值 1 (the default) draws a border around this frame. The value 0 removes the border around this frame, but you should instead use the CSS property border to control <iframe> borders.
longdesc

A URL of a long description of the frame's content. Due to widespread misuse, this is not helpful for non-visual browsers.

marginheight

The amount of space in pixels between the frame's content and its top and bottom borders.

marginwidth

The amount of space in pixels between the frame's content and its left and right borders.

scrolling
Indicates when the browser should provide a scrollbar for the frame:
  • auto : Only when the frame's content is larger than its dimensions.
  • yes : Always show a scrollbar.
  • no : Never show a scrollbar.

Non-standard attributes

mozbrowser
见 bug 1318532 for exposing this to WebExtensions in Firefox.

Makes the <iframe> act like a top-level browser window. See Browser API 了解细节。
Available only to WebExtensions .

脚本

Inline frames, like <frame> elements, are included in the window.frames pseudo-array.

With the DOM HTMLIFrameElement object, scripts can access the window object of the framed resource via the contentWindow property. The contentDocument property refers to the document 在 <iframe> ，如同 contentWindow.document .

From the inside of a frame, a script can get a reference to its parent window with window.parent .

Script access to a frame's content is subject to the same-origin policy . Scripts cannot access most properties in other window objects if the script was loaded from a different origin, including scripts inside a frame accessing the frame's parent. Cross-origin communication can be achieved using Window.postMessage() .

Positioning and scaling

由于 replaced element , the position, alignment, and scaling of the embedded document within the <iframe> element's box, can be adjusted with the object-position and object-fit 特性。

范例

A simple <iframe>

An <iframe> in action. After creating the frame, when the user clicks a button, its title is displayed in an alert.

HTML 

<iframe src="https://mdn-samples.mozilla.org/snippets/html/iframe-simple-contents.html"
            title="iframe Example 1" width="400" height="300">
</iframe>

结果

可访问性关注

People navigating with assistive technology such as a screen reader can use the title 属性 在 <iframe> to label its content. The title's value should concisely describe the embedded content: 

<iframe title="Wikipedia page for Avocados" src="https://en.wikipedia.org/wiki/Avocado"></iframe>

Without this title, they have to navigate into the <iframe> to determine what its embedded content is. This context shift can be confusing and time-consuming, especially for pages with multiple <iframe> s and/or if embeds contain interactive content like video or audio.

规范

规范 状态 注释
Referrer Policy
The definition of 'referrerpolicy attribute' in that specification. 		候选推荐 添加 referrerpolicy 属性。
HTML 实时标准
The definition of '<iframe>' in that specification. 		实时标准
HTML5
The definition of '<iframe>' in that specification. 		推荐
HTML 4.01 Specification
The definition of '<iframe>' in that specification. 		推荐
Screen Orientation API 工作草案 添加 allow-orientation-lock 到 sandbox 属性。

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
iframe Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 注意事项
完整支持 Yes 注意事项
注意事项 resize CSS property doesn't have any effect on this element due to bug 680823 .
IE 完整支持 Yes Opera 完整支持 Yes Safari 完整支持 Yes 注意事项
完整支持 Yes 注意事项
注意事项 Safari has a bug that prevents iframes from loading if the iframe element was hidden when added to the page. iframeElement.src = iframeElement.src should cause it to load the iframe.
WebView Android 完整支持 Yes Chrome Android 完整支持 Yes Firefox Android 完整支持 Yes 注意事项
完整支持 Yes 注意事项
注意事项 resize CSS property doesn't have any effect on this element due to bug 680823 .
Opera Android 完整支持 Yes Safari iOS 完整支持 Yes 注意事项
完整支持 Yes 注意事项
注意事项 Safari has a bug that prevents iframes from loading if the iframe element was hidden when added to the page. iframeElement.src = iframeElement.src should cause it to load the iframe.
Samsung Internet Android 完整支持 Yes
align 弃用 Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
allow 实验性 Chrome 完整支持 60 Edge 完整支持 79 Firefox 完整支持 74 IE 不支持 No Opera 完整支持 47 Safari 完整支持 11.1 WebView Android 完整支持 60 Chrome Android 完整支持 60 Firefox Android 不支持 No Opera Android 完整支持 44 Safari iOS 完整支持 11.3 Samsung Internet Android 完整支持 8.0
allowfullscreen Chrome 完整支持 27
完整支持 27
不支持 17 — 38 Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge 完整支持 ≤79
完整支持 ≤79
不支持 12 — 79 Prefixed
Prefixed Implemented with the vendor prefix: ms
Firefox 完整支持 18
完整支持 18
完整支持 9 Prefixed
Prefixed Implemented with the vendor prefix: moz
IE 完整支持 11 Prefixed
完整支持 11 Prefixed
Prefixed Implemented with the vendor prefix: ms
Opera 完整支持 ≤15
完整支持 ≤15
不支持 15 — 25 Prefixed
Prefixed Implemented with the vendor prefix: webkit
Safari 完整支持 7
完整支持 7
完整支持 Yes Prefixed
Prefixed Implemented with the vendor prefix: webkit
WebView Android 完整支持 37
完整支持 37
不支持 37 — 38 Prefixed
Prefixed Implemented with the vendor prefix: webkit
Chrome Android 完整支持 27
完整支持 27
不支持 18 — 38 Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android 完整支持 18
完整支持 18
完整支持 9 Prefixed
Prefixed Implemented with the vendor prefix: moz
Opera Android 完整支持 ≤14
完整支持 ≤14
不支持 14 — 25 Prefixed
Prefixed Implemented with the vendor prefix: webkit
Safari iOS 完整支持 7
完整支持 7
完整支持 Yes Prefixed
Prefixed Implemented with the vendor prefix: webkit
Samsung Internet Android 完整支持 1.5
完整支持 1.5
不支持 1.0 — 3.0 Prefixed
Prefixed Implemented with the vendor prefix: webkit
allowpaymentrequest 实验性 Chrome 不支持 No Edge 不支持 No Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 不支持 No WebView Android 不支持 No Chrome Android 不支持 No Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 不支持 No Samsung Internet Android 不支持 No
Aspect ratio computed from width and height 属性 Chrome 完整支持 79 Edge 完整支持 79 Firefox 完整支持 71
完整支持 71
不支持 69 — 71 Disabled
Disabled ). To change preferences in Firefox, visit
IE 不支持 No Opera 完整支持 66 Safari 完整支持 14 WebView Android 完整支持 79 Chrome Android 完整支持 79 Firefox Android 完整支持 79 Opera Android 完整支持 57 Safari iOS 完整支持 14 Samsung Internet Android 完整支持 12.0
External protocol URLs blocked 弃用 Chrome ? Edge ? Firefox 完整支持 67 IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Firefox Android 完整支持 67 Opera Android ? Safari iOS ? Samsung Internet Android ?
frameborder 弃用 Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
height Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
loading 实验性 Chrome 完整支持 76 Edge 完整支持 79 Firefox 不支持 No IE 不支持 No Opera 完整支持 63 Safari 不支持 No 注意事项
不支持 No 注意事项
注意事项 见 bug 196698
WebView Android 不支持 No Chrome Android 完整支持 76 Firefox Android 不支持 No Opera Android 完整支持 54 Safari iOS 不支持 No 注意事项
不支持 No 注意事项
注意事项 见 bug 196698
Samsung Internet Android 不支持 No
longdesc 弃用 Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
marginheight 弃用 Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
marginwidth 弃用 Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes 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 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
referrerpolicy Chrome 完整支持 51 Edge 完整支持 79 Firefox 完整支持 50 IE 不支持 No Opera 完整支持 38 Safari 完整支持 11.1 WebView Android 完整支持 51 Chrome Android 完整支持 51 Firefox Android 完整支持 50 Opera Android 完整支持 41 Safari iOS 不支持 No Samsung Internet Android 完整支持 7.2
sandbox Chrome 完整支持 4 Edge 完整支持 12 Firefox 完整支持 17 IE 完整支持 10 Opera 完整支持 15 Safari 完整支持 5 WebView Android 完整支持 Yes Chrome Android 完整支持 Yes Firefox Android 完整支持 17 Opera Android ? Safari iOS 完整支持 4.2 Samsung Internet Android 完整支持 Yes
sandbox="allow-downloads" Chrome 完整支持 83 Edge 完整支持 83 Firefox 完整支持 82 IE 不支持 No Opera ? Safari 不支持 No WebView Android 完整支持 83 Chrome Android 完整支持 83 Firefox Android 完整支持 82 Opera Android ? Safari iOS 不支持 No Samsung Internet Android ?
sandbox="allow-modals" Chrome ? Edge ? Firefox 完整支持 49 IE 不支持 No Opera ? Safari ? WebView Android ? Chrome Android ? Firefox Android 完整支持 49 Opera Android ? Safari iOS ? Samsung Internet Android ?
sandbox="allow-popups" Chrome 完整支持 Yes Edge 完整支持 ≤18 Firefox 完整支持 28 IE ? Opera 完整支持 Yes Safari ? WebView Android 完整支持 Yes Chrome Android 完整支持 Yes Firefox Android 完整支持 27 Opera Android ? Safari iOS ? Samsung Internet Android 完整支持 Yes
sandbox="allow-popups-to-escape-sandbox" Chrome 完整支持 46 Edge 完整支持 79 Firefox 完整支持 49 IE 不支持 No Opera 完整支持 32 Safari ? WebView Android 完整支持 46 Chrome Android 完整支持 46 Firefox Android 完整支持 49 Opera Android 完整支持 32 Safari iOS ? Samsung Internet Android 完整支持 5.0
sandbox="allow-presentation" Chrome 完整支持 53 Edge 完整支持 79 Firefox 完整支持 50 IE 不支持 No Opera 完整支持 40 Safari ? WebView Android 不支持 No Chrome Android 完整支持 53 Firefox Android 完整支持 50 Opera Android 完整支持 41 Safari iOS ? Samsung Internet Android 完整支持 6.0
sandbox="allow-storage-access-by-user-activation" 实验性 非标 Chrome 不支持 No Edge 不支持 No Firefox 完整支持 65 Disabled
完整支持 65 Disabled
Disabled ). To change preferences in Firefox, visit
IE 不支持 No Opera 不支持 No Safari 完整支持 11.1 WebView Android 不支持 No Chrome Android 不支持 No Firefox Android 完整支持 65 Disabled
完整支持 65 Disabled
Disabled ). To change preferences in Firefox, visit
Opera Android 不支持 No Safari iOS 完整支持 11.3 Samsung Internet Android 不支持 No
sandbox="allow-top-navigation-by-user-activation" Chrome 完整支持 58 Edge 完整支持 79 Firefox 完整支持 79 IE 不支持 No Opera 完整支持 45 Safari 完整支持 11.1 注意事项
完整支持 11.1 注意事项
注意事项 Not initially available in 11.1, but added in sub-version 13605.1.33.1.2.
WebView Android 完整支持 58 Chrome Android 完整支持 58 Firefox Android 完整支持 79 Opera Android 完整支持 43 Safari iOS ? Samsung Internet Android 完整支持 7.0
scrolling 弃用 Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
src Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes Opera Android 完整支持 Yes Safari iOS 完整支持 Yes Samsung Internet Android 完整支持 Yes
srcdoc Chrome 完整支持 20 Edge 完整支持 79 Firefox 完整支持 25 IE 不支持 No Opera 完整支持 15 Safari 完整支持 6 WebView Android 完整支持 37 Chrome Android 完整支持 25 Firefox Android 完整支持 25 Opera Android ? Safari iOS ? Samsung Internet Android 完整支持 1.5
width Chrome 完整支持 1 Edge 完整支持 12 Firefox 完整支持 Yes 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 Yes 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

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

非标。预期跨浏览器支持较差。

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

见实现注意事项。

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

元数据

  • 最后修改：
  1. <audio>
  2. <embed>
  3. <iframe>
  4. <img>
  5. <map>
  6. <object>
  7. <param>
  8. <picture>
  9. <source>
  10. <track>
  11. <video>
  12. 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>

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