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Changes Since the 3 January 2013 Working Draft</a></ul><li><ahref=#acknowledgments><spanclass=secno></span>Acknowledgments</a><li><ahref=#conformance><spanclass=secno></span>
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Changes Since the 30 July 2013 Last Call Working Draft</a></ul><li><ahref=#acknowledgments><spanclass=secno></span>Acknowledgments</a><li><ahref=#conformance><spanclass=secno></span>
Importing Style Sheets: the <aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a> rule</span><aclass=self-linkhref=#at-import></a></h2>
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<p>
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The <dfndata-dfn-type=at-ruledata-export="" id=at-ruledef-import><aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a><aclass=self-linkhref=#at-ruledef-import></a></dfn> rule allows users to import style rules from other style sheets.
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The <dfnclass=css-codedata-dfn-type=at-ruledata-export="" id=at-ruledef-import><aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a><aclass=self-linkhref=#at-ruledef-import></a></dfn> rule allows users to import style rules from other style sheets.
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Any <aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a> rules must precede all other at-rules and style rules in a style sheet
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(besides <aclass=cssdata-link-type=maybehref=http://dev.w3.org/csswg/css-syntax-3/#at-ruledef-charset>@charset</a>, which must be the first thing in the style sheet if it exists),
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or else the <aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a> rule is invalid.
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The syntax of <aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a> is:
For example, the <aclass=propertydata-link-type=propdeschref=http://dev.w3.org/csswg/css-fonts-3/#propdef-fonttitle=font>font</a> property
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is a <ahref=#shorthand-properties>shorthand</a> property for setting <adata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-style>font-style</a>, <adata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-variant>font-variant</a>, <adata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-weight>font-weight</a>, <aclass=propertydata-link-type=propdeschref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-sizetitle=font-size>font-size</a>, <aclass=propertydata-link-type=propdeschref=http://www.w3.org/TR/CSS21/visudet.html#propdef-line-heighttitle=line-height>line-height</a>, and <adata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-family>font-family</a> all at once.
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is a <ahref=#shorthand-properties>shorthand</a> property for setting <aclass=css-codedata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-style>font-style</a>, <aclass=css-codedata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-variant>font-variant</a>, <aclass=css-codedata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-weight>font-weight</a>, <aclass=propertydata-link-type=propdeschref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-sizetitle=font-size>font-size</a>, <aclass=propertydata-link-type=propdeschref=http://www.w3.org/TR/CSS21/visudet.html#propdef-line-heighttitle=line-height>line-height</a>, and <aclass=css-codedata-link-type=propertyhref=http://dev.w3.org/csswg/css-fonts-3/#propdef-font-family>font-family</a> all at once.
Resetting a Property: the <aclass=cssdata-link-type=maybehref=#valuedef-initial>initial</a> keyword</span><aclass=self-linkhref=#initial></a></h4>
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<p>
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If the <ahref=#cascaded-value>cascaded value</a> is the <dfndata-dfn-for=alldata-dfn-type=valuedata-export="" id=valuedef-initial><aclass=cssdata-link-type=maybehref=#valuedef-initial>initial</a><aclass=self-linkhref=#valuedef-initial></a></dfn> keyword,
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If the <ahref=#cascaded-value>cascaded value</a> is the <dfnclass=css-codedata-dfn-for=alldata-dfn-type=valuedata-export="" id=valuedef-initial><aclass=cssdata-link-type=maybehref=#valuedef-initial>initial</a><aclass=self-linkhref=#valuedef-initial></a></dfn> keyword,
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the property’s <ahref=#initial-value>initial value</a> becomes its <ahref=#specified-value>specified value</a>.
Explicit Inheritance: the <aclass=cssdata-link-type=maybehref=#valuedef-inherit>inherit</a> keyword</span><aclass=self-linkhref=#inherit></a></h4>
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<p>
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If the <ahref=#cascaded-value>cascaded value</a> of a property is the <dfndata-dfn-for=alldata-dfn-type=valuedata-export="" id=valuedef-inherit><aclass=cssdata-link-type=maybehref=#valuedef-inherit>inherit</a><aclass=self-linkhref=#valuedef-inherit></a></dfn> keyword,
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If the <ahref=#cascaded-value>cascaded value</a> of a property is the <dfnclass=css-codedata-dfn-for=alldata-dfn-type=valuedata-export="" id=valuedef-inherit><aclass=cssdata-link-type=maybehref=#valuedef-inherit>inherit</a><aclass=self-linkhref=#valuedef-inherit></a></dfn> keyword,
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the <ahref=#inherited-value>inherited value</a> becomes the property’s <ahref=#specified-valuetitle="specified value">specified</a> and <ahref=#computed-value>computed values</a>.
Erasing All Declarations: the <aclass=cssdata-link-type=maybehref=#valuedef-unset>unset</a> keyword</span><aclass=self-linkhref=#inherit-initial></a></h4>
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<p>
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If the <ahref=#cascaded-value>cascaded value</a> of a property is the <dfndata-dfn-for=alldata-dfn-type=valuedata-export="" id=valuedef-unset><aclass=cssdata-link-type=maybehref=#valuedef-unset>unset</a><aclass=self-linkhref=#valuedef-unset></a></dfn> keyword,
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If the <ahref=#cascaded-value>cascaded value</a> of a property is the <dfnclass=css-codedata-dfn-for=alldata-dfn-type=valuedata-export="" id=valuedef-unset><aclass=cssdata-link-type=maybehref=#valuedef-unset>unset</a><aclass=self-linkhref=#valuedef-unset></a></dfn> keyword,
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then if it is an inherited property, this is treated as <aclass=cssdata-link-type=maybehref=#valuedef-inherit>inherit</a>,
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and if it is not, this is treated as <aclass=cssdata-link-type=maybehref=#valuedef-initial>initial</a>.
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This keyword effectively erases all <ahref=#declared-value>declared values</a> occurring earlier in the <ahref=#cascade>cascade</a>,
Changes Since the 3 January 2013 Working Draft</span><aclass=self-linkhref=#changes-2013></a></h3>
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Changes Since the 30 July 2013 Last Call Working Draft</span><aclass=self-linkhref=#changes-2013></a></h3>
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<p>The following major changes were made to this specification since the
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<ahref=http://www.w3.org/TR/2013/WD-css3-cascade-20130103/>3 January 2013 Working Draft</a>:
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<p>The following changes were made to this specification since the
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<ahref=http://www.w3.org/TR/2013/WD-css-cascade-3-20130730/>30 July 2013 Last Call Working Draft</a>:
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<p><ul>
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<li>Dropped the <spanclass=cssdata-link-type=maybe>default</span> keyword.
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<li>Added the <aclass=cssdata-link-type=maybehref=#valuedef-unset>unset</a> keyword.
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<li>Excluded <aclass=propertydata-link-type=propdeschref=http://dev.w3.org/csswg/css-writing-modes-3/#propdef-unicode-bidititle=unicode-bidi>unicode-bidi</a> and <aclass=propertydata-link-type=propdeschref=http://dev.w3.org/csswg/css-writing-modes-3/#propdef-directiontitle=direction>direction</a> from the <aclass=propertydata-link-type=propdeschref=#propdef-alltitle=all>all</a> shorthand.
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<li>Various clarifications.
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</ul>
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<p><ul>
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<li>Clarified interaction of media-dependent <aclass=cssdata-link-type=maybehref=#at-ruledef-import>@import</a> statements and style sheet loading requirements.
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</ul>
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<p>A <ahref=http://dev.w3.org/csswg/css-cascade/issues-lc-2013>Disposition of Comments</a> is available.
Abstract: This CSS module describes how to collate style rules and assign values to all properties on all elements. By way of cascading and inheritance, values are propagated for all properties on all elements.
@@ -907,17 +908,16 @@ <h2 id="changes">
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Changes</h2>
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<h3id="changes-2013">
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Changes Since the 3 January 2013 Working Draft</h3>
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Changes Since the 30 July 2013 Last Call Working Draft</h3>
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<p>The following major changes were made to this specification since the
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<ahref="http://www.w3.org/TR/2013/WD-css3-cascade-20130103/">3 January 2013 Working Draft</a>:
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<p>The following changes were made to this specification since the
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<ahref="http://www.w3.org/TR/2013/WD-css-cascade-3-20130730/">30 July 2013 Last Call Working Draft</a>:
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<ul>
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<li>Dropped the ''default'' keyword.
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<li>Added the ''unset'' keyword.
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<li>Excluded 'unicode-bidi' and 'direction' from the 'all' shorthand.
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<li>Various clarifications.
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</ul>
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<ul>
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<li>Clarified interaction of media-dependent ''@import'' statements and style sheet loading requirements.
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</ul>
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<p>A <ahref="http://dev.w3.org/csswg/css-cascade/issues-lc-2013">Disposition of Comments</a> is available.
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