HTML ＜iframe＞ Tag
发布时间：2025-08-14 06:16:26 作者：佚名
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<div class="w3-example">
<p>An inline frame is marked up as follows:</p>
<div class="w3-code notranslate htmlHigh">
<iframe src=https://www.w3schools.com/tags/"https://www.w3schools.com" title="W3Schools Free
Online Web Tutorials"></iframe>
</div>
<a target="_blank" href="https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_iframe" class="w3-btn w3-margin-bottom">Try it Yourself »</a>
</div>
<p>More "Try it Yourself" examples below.</p>
<hr>
<p>The tag specifies an inline frame.</p>
<p>An inline frame is used to embed another document within the current HTML document.</p>
<p><b>Tip:</b> Use CSS to style the
(see example below). </p>
<p><strong>Tip:</strong> It is a good practice to always include a title
attribute for the . This is used
by screen readers to read out what the content of the
is.</p>
<hr>
<table class="browserref notranslate">
<tr>
<th style="width:20%;font-size:16px;text-align:left;">Element</th>
<th style="width:16%;" class="bsChrome" title="Chrome"></th>
<th style="width:16%;" class="bsEdge" title="Internet Explorer / Edge"></th>
<th style="width:16%;" class="bsFirefox" title="Firefox"></th>
<th style="width:16%;" class="bsSafari" title="Safari"></th>
<th style="width:16%;" class="bsOpera" title="Opera"></th>
</tr>
<tr>
<td style="text-align:left;"><iframe></td>
<td>Yes</td>
<td>Yes</td>
<td>Yes</td>
<td>Yes</td>
<td>Yes</td>
</tr>
</table>
<hr>
<table class="ws-table-all notranslate">
<tr>
<th style="width:20%">Attribute</th>
<th style="width:30%">Value</th>
<th style="width:50%">Description</th>
</tr>
<tr>
<td>allow</td>
<td> </td>
<td>Specifies a feature policy for the <iframe></td>
</tr>
<tr>
<td>allowfullscreen</td>
<td>true<br>false</td>
<td>Set to true if the <iframe> can activate fullscreen mode by calling the
requestFullscreen() method</td>
</tr>
<tr>
<td>allowpaymentrequest</td>
<td>true<br>false</td>
<td>Set to true if a cross-origin <iframe> should be allowed to invoke the
Payment Request API</td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_height.asp">height</a></td>
<td><i>pixels</i></td>
<td>Specifies the height of an <iframe>. Default height is 150 pixels</td>
</tr>
<tr>
<td>loading</td>
<td>eager<br>lazy</td>
<td>Specifies whether a browser should load an iframe immediately or to
defer loading of iframes until some conditions are met</td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_name.asp">name</a></td>
<td><i>text</i></td>
<td>Specifies the name of an <iframe></td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_referrerpolicy.asp">referrerpolicy</a></td>
<td>no-referrer<br>no-referrer-when-downgrade<br>origin<br>
origin-when-cross-origin<br>same-origin<br>strict-origin-when-cross-origin<br>unsafe-url</td>
<td>Specifies which referrer information to send when
fetching the iframe </td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_sandbox.asp">sandbox</a></td>
<td>allow-forms<br>allow-pointer-lock<br>allow-popups<br>
allow-same-origin<br>
allow-scripts<br>
allow-top-navigation</td>
<td>Enables an extra set of restrictions for the content in an <iframe></td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_src.asp">src</a></td>
<td><i>URL</i></td>
<td>Specifies the address of the document to embed in the <iframe></td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_srcdoc.asp">srcdoc</a></td>
<td><i>HTML_code</i></td>
<td>Specifies the HTML content of the page to show in the <iframe></td>
</tr>
<tr>
<td><a href="https://www.w3schools.com/tags/att_iframe_width.asp">width</a></td>
<td><i>pixels</i></td>
<td>Specifies the width of an <iframe>. Default width is 300 pixels</td>
</tr>
</table>
<hr>
<div id="midcontentadcontainer" style="overflow:auto;text-align:center">
</div>
<hr>
<p>The tag also supports the <a href="https://www.w3schools.com/tags/ref_standardattributes.asp">Global Attributes in HTML</a>.</p>
<hr>
<p>The tag also supports the <a href="https://www.w3schools.com/tags/ref_eventattributes.asp">Event Attributes in HTML</a>.</p>
<hr>
<div class="w3-example">
<p>Add and remove iframe borders (with CSS):</p>
<div class="w3-code notranslate htmlHigh">
<iframe src=https://www.w3schools.com/tags/"/default.asp" width="100%" height="300" style="border:1px solid
black;"><br></iframe><br><br><iframe src=https://www.w3schools.com/tags/"/default.asp" width="100%"
height="300" style="border:none;"><br></iframe></div>
<a target="_blank" href="https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_iframe_frameborder_css" class="w3-btn w3-margin-bottom">Try it Yourself »</a>
</div>
<hr>
<p>HTML tutorial: <a href="https://www.w3schools.com/html/html_iframe.asp">HTML Iframes</a></p>
<p>HTML DOM reference: <a href="https://www.w3schools.com/jsref/dom_obj_frame.asp">IFrame Object</a></p>
<hr>
<p>Most browsers will display the element with the following default values: </p>
<div class="w3-example">
<div class="w3-code notranslate cssHigh">
iframe:focus { <br> outline: none;<br>}<br><br>
iframe[seamless] { <br> display: block;<br>} </div>
</div>
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