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+---
+title: background-attachment
+slug: Web/CSS/background-attachment
+tags:
+  - CSS
+  - CSS Background
+  - CSS Property
+  - Reference
+translation_of: Web/CSS/background-attachment
+---
+<div>{{CSSRef}}</div>
+
+<p><strong><code>background-attachment</code></strong> 這個 <a href="/en-US/docs/CSS">CSS</a> 屬性能夠設定，背景圖片的位置是否要固定在 {{glossary("viewport")}}（視圖）上，還是背景圖片會隨著它的 containing block（外層容器）一起滾動。</p>
+
+<div>{{EmbedInteractiveExample("pages/css/background-attachment.html")}}</div>
+
+
+
+<h2 id="Syntax" name="Syntax">語法</h2>
+
+<pre class="brush: css no-line-numbers">/* Keyword values */
+background-attachment: scroll;
+background-attachment: fixed;
+background-attachment: local;
+
+/* Global values */
+background-attachment: inherit;
+background-attachment: initial;
+background-attachment: unset;
+</pre>
+
+<p><code>background-attachment</code> 屬性的值，可以是下方清單中的其中之一。</p>
+
+<h3 id="Values">Values</h3>
+
+<dl>
+ <dt><code>fixed</code></dt>
+ <dd>讓背景相對於 viewport（視圖）的移動是固定的。即便元素中的內容是可滾動的，背景也不會在滾動元素內容時跟著移動。(這個屬性與 {{cssxref("background-clip", "background-clip: text", "#text")}} 不相容。)</dd>
+ <dt><code>local</code></dt>
+ <dd>讓背景相對於元素的內容是固定的，且背景在滾動元素的內容時會跟著移動。另外，背景的繪製與定位區域是相對於元素的可滾動區域，而不是包裹著它們的邊框。</dd>
+ <dt><code>scroll</code></dt>
+ <dd>讓背景相對於元素本身是固定的，使背景在滾動元素的內容時不會跟著移動。（It is effectively attached to the element's border.）</dd>
+</dl>
+
+<h3 id="Formal_syntax">Formal syntax</h3>
+
+<pre class="syntaxbox">{{csssyntax}}
+</pre>
+
+<h2 id="Examples" name="Examples">例子</h2>
+
+<h3 id="Simple_example">Simple example</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;p&gt;
+  There were doors all round the hall, but they were all locked; and when
+  Alice had been all the way down one side and up the other, trying every
+  door, she walked sadly down the middle, wondering how she was ever to
+  get out again.
+&lt;/p&gt;</pre>
+
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush:css; highlight:[3];">p {
+  background-image: url("https://mdn.mozillademos.org/files/12057/starsolid.gif");
+  background-attachment: fixed;
+}
+</pre>
+
+<h4 id="Result">Result</h4>
+
+<p>{{EmbedLiveSample("Simple_example")}}</p>
+
+<h3 id="Multiple_background_images">Multiple background images</h3>
+
+<p>這個屬性支援多個背景圖片。你可以對每個背景設定不同的 <code>&lt;attachment&gt;</code>。每個背景圖片會依序對應在 <code>&lt;attachment&gt;</code> 設定的類型。</p>
+
+<h4 id="HTML_2">HTML</h4>
+
+<pre class="brush: html">&lt;p&gt;
+  There were doors all round the hall, but they were all locked; and when
+  Alice had been all the way down one side and up the other, trying every
+  door, she walked sadly down the middle, wondering how she was ever to
+  get out again.
+
+  Suddenly she came upon a little three-legged table, all made of solid
+  glass; there was nothing on it except a tiny golden key, and Alice's
+  first thought was that it might belong to one of the doors of the hall;
+  but, alas! either the locks were too large, or the key was too small,
+  but at any rate it would not open any of them. However, on the second
+  time round, she came upon a low curtain she had not noticed before, and
+  behind it was a little door about fifteen inches high: she tried the
+  little golden key in the lock, and to her great delight it fitted!
+&lt;/p&gt;</pre>
+
+<h4 id="CSS_2">CSS</h4>
+
+<pre class="brush:css; highlight:[3];">p {
+  background-image: url("https://mdn.mozillademos.org/files/12057/starsolid.gif"),
+      url("https://mdn.mozillademos.org/files/12059/startransparent.gif");
+  background-attachment: fixed, scroll;
+  background-repeat: no-repeat, repeat-y;
+}</pre>
+
+<h4 id="Result_2">Result</h4>
+
+<p>{{EmbedLiveSample("Multiple_background_images")}}</p>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('CSS3 Backgrounds', '#the-background-attachment', 'background-attachment')}}</td>
+   <td>{{Spec2('CSS3 Backgrounds')}}</td>
+   <td>The shorthand property has been extended to support multiple backgrounds and the <code>local</code> value.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS2.1', 'colors.html#propdef-background-attachment', 'background-attachment')}}</td>
+   <td>{{Spec2('CSS2.1')}}</td>
+   <td>No significant change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS1', '#background-attachment', 'background-attachment')}}</td>
+   <td>{{Spec2('CSS1')}}</td>
+   <td>No significant change.</td>
+  </tr>
+ </tbody>
+</table>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("css.properties.background-attachment")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/CSS/CSS_Backgrounds_and_Borders/Using_multiple_backgrounds">Using multiple backgrounds</a></li>
+</ul>