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----
-title: '@document'
-slug: Web/CSS/@document
-translation_of: Web/CSS/@document
----
-<div>{{CSSRef}}{{SeeCompatTable}}</div>
-
-<p>The <strong><code>@document</code></strong> <a href="/en-US/docs/Web/CSS">CSS</a> <a href="/en-US/docs/Web/CSS/At-rule">at-rule</a> restricts the style rules contained within it based on the URL of the document. It is designed primarily for user-defined style sheets, though it can be used on author-defined style sheets, too.</p>
-
-<pre class="brush: css no-line-numbers">@document url("https://www.example.com/") {
-  h1 {
-    color: green;
-  }
-}
-</pre>
-
-<ul>
-</ul>
-
-<h2 id="Syntax">Syntax</h2>
-
-
-
-<p>Una regla @document puede especificar una o más funciones coincidentes. Si alguna de las funciones se aplica a una URL determinada, la regla tendrá efecto en esa URL. Las funciones disponibles son:</p>
-
-<ul>
- <li><code>url()</code>, which matches an exact URL.</li>
- <li><code>url-prefix()</code>, which matches if the document URL starts with the value provided.</li>
- <li><code>domain()</code>, which matches if the document URL is on the domain provided (or a subdomain of it).</li>
- <li><code>regexp()</code>, which matches if the document URL is matched by the <a href="/en-US/docs/Web/JavaScript/Guide/Regular_Expressions">regular expression</a> provided. The expression must match the entire URL.</li>
-</ul>
-
-<p>The values provided to the <code>url()</code>, <code>url-prefix()</code>, and <code>domain()</code> functions can be optionally enclosed by single or double quotes. The values provided to the <code>regexp()</code> function <em>must</em> be enclosed in quotes.</p>
-
-<p>Escaped values provided to the <code>regexp()</code> function must additionally be escaped from the CSS. For example, a <code>.</code> (period) matches any character in regular expressions. To match a literal period, you would first need to escape it using regular expression rules (to <code>\.</code>), then escape that string using CSS rules (to <code>\\.</code>).</p>
-
-<div class="note">
-<p><strong>Note</strong>: There is a -moz-prefixed version of this property — <code>@-moz-document</code>. This has been limited to use only in user and UA sheets in Firefox 59 in Nightly and Beta — an experiment designed to mitigate potential CSS injection attacks ({{bug(1035091)}}).</p>
-</div>
-
-<h3 id="Formal_syntax">Formal syntax</h3>
-
-{{csssyntax}}
-
-<h2 id="Example">Example</h2>
-
-<h3 id="CSS">CSS</h3>
-
-<pre class="brush: css">@document url(http://www.w3.org/),
-          url-prefix(http://www.w3.org/Style/),
-          domain(mozilla.org),
-          regexp("https:.*") {
-  /* CSS rules here apply to:
-     - The page "http://www.w3.org/"
-     - Any page whose URL begins with "http://www.w3.org/Style/"
-     - Any page whose URL's host is "mozilla.org"
-       or ends with ".mozilla.org"
-     - Any page whose URL starts with "https:" */
-
-  /* Make the above-mentioned pages really ugly */
-  body {
-    color: purple;
-    background: yellow;
-  }
-}
-</pre>
-
-<h2 id="Specifications">Specifications</h2>
-
-<p><a href="http://www.w3.org/TR/2012/WD-css3-conditional-20120911/#at-document">Initially</a> in {{SpecName('CSS3 Conditional')}}, <code>@document</code> has been <a href="http://www.w3.org/TR/2012/WD-css3-conditional-20121213/#changes">postponed</a> to Level 4.</p>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-
-
-<p>{{Compat("css.at-rules.document")}}</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><a class="external" href="http://lists.w3.org/Archives/Public/www-style/2004Aug/0135">Per-site user style sheet rules</a> on the www-style mailing list.</li>
-</ul>