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‎css3-cascade/Overview.html‎

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<head><meta content="text/html" http-equiv=Content-Type>
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<title>CSS3 module: Cascading and inheritance</title>
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<!--
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<link href="http://www.w3.org/Style/Group/css3-src/css3-template/default.css" rel="stylesheet" type="text/css">
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-->
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<link href="../default.css" rel=stylesheet type="text/css">
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<link href="http://www.w3.org/StyleSheets/TR/W3C-ED.css" rel=stylesheet
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type="text/css">
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<style>
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table { border-collapse: collapse; border: 1px solid black }
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th, td { border: 1px solid black; padding: 0.2em; text-align: left }
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.issue { color: red }
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</style>
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<body>
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<h1>CSS3 module: Cascading and inheritance</h1>
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<h2 class="no-num no-toc" id=longstatus>Editor's Draft 3 January 2009</h2>
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<h2 class="no-num no-toc" id=longstatus>Editor's Draft 6 January 2009</h2>
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<dl>
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<dt>This version:
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<dd><a
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href="http://www.w3.org/TR/2009/ED-css3-cascade-20090103">http://www.w3.org/TR/2009/ED-css3-cascade-20090103</a>
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href="http://www.w3.org/TR/2009/ED-css3-cascade-20090106">http://www.w3.org/TR/2009/ED-css3-cascade-20090106</a>
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<dt>Latest version:
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<dt>Editor:
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<dd>Håkon Wium Lie, Opera Software, howcome@opera.com
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<dd>H&aring;kon Wium Lie, Opera Software, howcome@opera.com
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</dl>
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<!--begin-copyright-->
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<p class=copyright><a
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<h2 class="no-num no-toc" id=abstract>Abstract</h2>
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<p>This CSS3 module describes how to find a value for every
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element/property combination in a document. Values can come from style
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sheets, or the property's initial value is used. By way of cascading and
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element/property combination in a document. Values either come from style
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sheets or the property's initial value. By way of cascading and
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inheritance, values are propagated to all element/property combinations.
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The output of the computations described in this module is the <em><a
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href="#specified">specified value</a></em>.
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href="#specified">specified value</a></em>. <!--
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The input to the computations described in this module
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is a set of style sheets of style sheets
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-->
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<h2 class="no-num no-toc" id=status>Status of this document</h2>
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module also exist in CSS2. Compared to CSS2, the cascading order has been
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changed in two cases as noted in the text.
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<p>This draft should not be cited except as "work in progress." It is a
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<p>This draft should not be cited except as "work in progress". It is a
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work item of the CSS working group and part of the <a href="/Style/">Style
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activity</a>. It may be modified or dropped altogether at any point in
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time. Implementations for the purpose of experimenting with the
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rel=biblioentry>[SELECT]<!--{{!SELECT}}--></a>, which describes <strong
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class=index id=specificity>specificity</strong>
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<li>Syntax <a href="#CSS3SYN"
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rel=biblioentry>[CSS3SYN]<!--{{!CSS3SYN}}--></a>, which describes how to
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parse CSS style sheets into <strong class=index id=declarations
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title=declaration>declarations</strong>
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<li>Syntax [[!CSS3SYNTAX]], which describes how to parse CSS style sheets
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<!-- into <strong title="declaration" class="index">declarations</strong>-->
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<li>Media Queries <a href="#MEDIAQ"
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rel=biblioentry>[MEDIAQ]<!--{{!MEDIAQ}}--></a>, which describe how to
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<li>otherwise, the initial value becomes the specified value
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</ol>
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<p>The specified value may need some computation before it can be used. For
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example, the specified value of the <span class=property>&lsquo;<code
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class=property>font-size</code>&rsquo;</span> property for a given element
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may be &lsquo;<code class=css>10em</code>&rsquo; which needs to be
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converted into device-specific units before being used to render a
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document. Computations on specified values are described in the <a
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href="/TR/css3-values">Values and Units</a> <a href="#CSS3VAL"
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rel=biblioentry>[CSS3VAL]<!--{{!CSS3VAL}}--></a> module.
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<p>The specified value may need some computation before it can be used.
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This is described in the values are described in the <a
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href="/TR/css3-values">Values and Units</a> [[!CSS3VALUES]] module.
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<h2 id=at-import><span class=secno>4. </span>Style sheets including other
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style sheets: the <code>@import</code> rule</h2>
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<p>All properties accept the &lsquo;<code class=css>inherit</code>&rsquo;
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value which explicitly specifies that the value will be determined by
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inheritance. The &lsquo;<code class=css>inherit</code>&rsquo; value can be
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used to strengthen inherited values, and it can also be used on properties
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that are not normally inherited. If the &lsquo;<code
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used to strengthen inherited values in the cascade, and it can also be
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used on properties that are not normally inherited. If the &lsquo;<code
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class=css>inherit</code>&rsquo; value is set on the root element, the
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property is assigned its initial value.
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</ul>
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<p>Each CSS declaration can have two levels of importance: normal (which is
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default) and important (which must be marked). The CSS3 syntax module <a
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href="#CSS3SYN" rel=biblioentry>[CSS3SYN]<!--{{!CSS3SYN}}--></a> describes
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how declarations are marked as important.
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default) and important (which must be marked). The CSS3 syntax module
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[[!CSS3SYNTAX]] describes how declarations are marked as important.
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<p>The weight of style sheets from the various origins, in ascending order,
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is:

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