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+---
+title: element
+slug: Web/CSS/element()
+tags:
+  - CSS
+  - CSS Function
+  - Layout
+  - Web
+  - 参考
+  - 布局
+translation_of: Web/CSS/element()
+---
+<div>{{CSSRef}}{{SeeCompatTable}}</div>
+
+<p><a href="/en-US/docs/Web/CSS">CSS</a> 函数 <strong><code>element()</code></strong> 定义了一个从任意的 HTML 元素中生成的图像 {{cssxref("&lt;image&gt;")}} 值。该图像值是实时的，这意味着如果被指定的 HTML 元素被更改，the CSS properties using the resulting value are automatically updated.</p>
+
+<p>一个特别实用的应用场景是，在某个 HTML {{HTMLElement("canvas")}} 元素中渲染图像，然后将其用作背景。</p>
+
+<p>在使用 Gecko 渲染引擎的浏览器中，可以使用非标准的 {{domxref("document.mozSetImageElement()")}} 方法，将某个元素指定为其他元素的背景图像。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox notranslate">element(<var>id</var>)</pre>
+
+<p>其中：</p>
+
+<dl>
+ <dt><var>id</var></dt>
+ <dd>The ID of an element to use as the background, specified using the HTML attribute #<em>id</em> on the element.</dd>
+</dl>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<p>在支持 <code>-moz-element()</code> 的 Firefox 中，可以<a href="/samples/cssref/moz-element.html" title="https://developer.mozilla.org/samples/cssref/moz-element.html">实地考察</a>这些例子。</p>
+
+<h3 id="一个比较现实的例子">一个比较现实的例子</h3>
+
+<p>这个例子将文档中另一个隐藏的 {{HTMLElement("div")}} 元素作为背景。被隐藏的元素本身使用了渐变背景，也包含了一些文字，渐变背景和文字都成为了第一个元素的背景。</p>
+
+<pre class="brush: html notranslate">&lt;div style="width:400px; height:400px; background:-moz-element(#myBackground1) no-repeat;"&gt;
+  &lt;p&gt;This box uses the element with the #myBackground1 ID as its background!&lt;/p&gt;
+&lt;/div&gt;
+
+&lt;div style="overflow:hidden; height:0;"&gt;
+  &lt;div id="myBackground1" style="width:1024px; height:1024px; background-image: linear-gradient(to right, red, orange, yellow, white);"&gt;
+  &lt;p style="transform-origin:0 0; transform: rotate(45deg); color:white;"&gt;This text is part of the background. Cool, huh?&lt;/p&gt;
+  &lt;/div&gt;
+&lt;/div&gt;</pre>
+
+<p>The {{HTMLElement("div")}} element with the ID "myBackground1" is used as the background for the content including the paragraph "This box uses the element with the #myBackground1 ID as its background!".</p>
+
+<p><img alt="example1.png" class="default internal" src="/@api/deki/files/4624/=example1.png"></p>
+
+<h3 id="一个有点怪怪的例子">一个有点怪怪的例子</h3>
+
+<p>This example uses a hidden {{HTMLElement("button")}} element in a repeating pattern as its background. This demonstrates that you can use arbitrary elements as background, but doesn't necessarily demonstrate good design practices.</p>
+
+<pre class="brush: html notranslate">&lt;div style="width:400px; height:100px; background:-moz-element(#myBackground2);"&gt;
+&lt;/div&gt;
+
+&lt;div style="overflow:hidden; height:0;"&gt;
+  &lt;button id="myBackground2" type="button"&gt;Evil button!&lt;/button&gt;
+&lt;/div&gt;
+</pre>
+
+<p><img alt="example2.png" class="default internal" src="/@api/deki/files/4625/=example2.png"></p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th>规范</th>
+   <th>状态</th>
+   <th>备注</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('CSS4 Images', '#element-notation', 'Using Elements as Images: the element() notation')}}</td>
+   <td>{{Spec2('CSS4 Images')}}</td>
+   <td>Deferred from CSS3 Images.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("css.types.image.element")}}</p>
+
+<h2 id="See_also" name="See_also">参见</h2>
+
+<ul>
+ <li>{{cssxref("_image", "image()")}}</li>
+ <li>{{cssxref("image-set", "image-set()")}}</li>
+ <li>{{cssxref("&lt;image&gt;")}}</li>
+ <li>{{cssxref("&lt;gradient&gt;")}}</li>
+ <li>{{cssxref("element()")}}</li>
+ <li>{{cssxref("cross-fade")}}</li>
+ <li>{{domxref("document.mozSetImageElement()")}}</li>
+</ul>