<p><span class="seoSummary"><strong>CSS3</strong> is the latest evolution of the <em>Cascading Style Sheets</em> language and aims at extending CSS2.1. It brings a lot of long-awaited novelties, like rounded corners, shadows, <a href="/en-US/docs/Web/Guide/CSS/Using_CSS_gradients" title="Using CSS gradients">gradients</a>, <a href="/en-US/docs/Web/Guide/CSS/Using_CSS_transitions" title="CSS transitions">transitions</a> or <a href="/en-US/docs/Web/Guide/CSS/Using_CSS_animations" title="CSS animations">animations</a>, as well as new layouts like <a href="/en-US/docs/Web/Guide/CSS/Using_multi-column_layouts" title="Using CSS multi-column layouts">multi-columns</a>, <a href="/en-US/docs/Web/Guide/CSS/Flexible_boxes">flexible box</a> or grid layouts.</span> Experimental parts are vendor-prefixed and should either be avoided in production environments, or used with extreme caution as both their syntax and semantics can change in the future.</p>
<h2 id="Modules_and_the_standardization_process">Modules and the standardization process</h2>
<p>CSS Level 2 needed 9 years, from August 2002 to June 2011 to reach the Recommendation status. This was due to the fact that a few secondary features hold back the whole specification. In order to accelerate the standardization of non-problematic features, the <a class="external" href="https://www.w3.org/blog/CSS/" title="https://www.w3.org/blog/CSS/">CSS Working Group</a> of the W3C, in a decision referred as the <a class="external" href="https://fantasai.inkedblade.net/weblog/2011/inside-csswg/modules" title="https://fantasai.inkedblade.net/weblog/2011/inside-csswg/modules">Beijing doctrine</a>, divided CSS in smaller components called <em>modules</em> . Each of these modules is now an independent part of the language and moves towards standardization at its own pace. While some modules are already W3C Recommendations, other still are early Working Drafts. New modules are also added when new needs are identified.</p>
<p><a href="/@api/deki/files/6120/=CSS_Modules_and_Snapshots.png" title="CSS_Modules_and_Snapshots.png"><img alt="CSS Modules and Snapshots as defined since CSS3" class="internal lwrap" src="/files/3623/CSS_Modules_and_Snapshots.png" style="float:left; width:550px" /> </a> Formally, there is no CSS3 standard <em>per se</em> . Each module being standardized independently, the standard CSS consists of CSS2.1 amended and extended by the completed modules, not necessary all with the same level number. At each point of time, a snapshot of the CSS standard can be defined, listing CSS2.1 and the mature modules.</p>
<p>The W3 consortium periodically publishes such snapshots, like in <a class="external" href="https://www.w3.org/TR/css-beijing/" title="https://www.w3.org/TR/css-beijing/">2007</a> or <a class="external" href="https://www.w3.org/TR/css-2010/" title="https://www.w3.org/TR/css-2010/">2010.</a></p>
<p>Though today no module with a level greater than 3 is standardized, this will change in the future. Some modules, like Selectors 4 or CSS Borders and Backgrounds Level 4 already have an Editor's Draft, though they haven't yet reached the First Published Working Draft status.</p>
<h2 id="CSS_modules_status" style="clear:both;">CSS modules status</h2>
<h3 id="Stable_modules">Stable modules</h3>
<p>A few CSS modules are already fairly stable and have reached one of the three recommendation level of the CSSWG: Candidate Recommendation, Proposed Recommendation or Recommendation. These can be used without prefix and are pretty stable, though a few features can still be dropped at the Candidate Recommendation stage.</p>
<p>These modules extend and amend the CSS2.1 specification which build the core of the specification. Together with it, they are the current snapshot of the CSS specification.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td class="thirdColumn greenBg"><strong>{{ SpecName("CSS3 Colors", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Colors") }} since June 7th, 2011</td>
</tr>
<tr>
<td colspan="2">
<p>Adds the {{ cssxref("opacity") }} property, and the <code>hsl</code><code>()</code>, <code>hsla()</code>, <code>rgba()</code> and <code>rgb()</code> functions to create {{ xref_csscolorvalue() }} values. It also defines the <code>currentColor</code> keyword as a valid color.</p>
<p>The <code>transparent</code> color is now a real color (thanks to the support for the alpha channel) and is a now an alias for <code>rgba(0,0,0,0.0)</code> .</p>
<p>It deprecates the <a href="https://www.w3.org/TR/CSS2/ui.html#system-colors">system-color keywords that shouldn't be used in a production environment anymore</a>.</p>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(128,255,128);"><strong>{{ SpecName("CSS3 Selectors", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Selectors") }} since September 29th, 2011</td>
</tr>
<tr>
<td colspan="2">
<p>Adds:</p>
<ul>
<li>Substring matching attribute selectors, <code>E[attribute^="value"]</code>, <code>E[attribute$="value"]</code>, <code>E[attribute*="value"]</code> .</li>
<li>New pseudo-classes: {{ cssxref(":target") }}, {{ cssxref(":enabled") }} and {{ cssxref(":disabled") }}, {{ cssxref(":checked") }}, {{ cssxref(":indeterminate") }}, {{ cssxref(":root") }}, {{ cssxref(":nth-child") }} and {{ cssxref(":nth-last-child") }}, {{ cssxref(":nth-of-type") }} and {{ cssxref(":nth-last-of-type") }}, {{ cssxref(":last-child") }}, {{ cssxref(":first-of-type") }} and {{ cssxref(":last-of-type") }}, {{ cssxref(":only-child") }} and {{ cssxref(":only-of-type") }},{{ cssxref(":empty") }}, and {{ cssxref(":not") }}.</li>
<li>Pseudo-elements are now characterized by two colons rather than one: <code>:after</code> becomes {{ cssxref("::after") }}, <code>:before</code> becomes {{ cssxref("::before") }}, <code>:first-letter</code> becomes {{ cssxref("::first-letter") }}, and <code>:first-line</code> becomes {{ cssxref("::first-line") }}.</li>
<li>The new <em style="font-style:italic">general sibling combinator</em> ( <code>h1~pre</code> ).</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>The <a class="external" href="https://dev.w3.org/csswg/selectors4/" title="https://dev.w3.org/csswg/selectors4/">next iteration of the Selectors specification</a> is already in progress, though it still hasn't reached the First Public Working Draft stage.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(128,255,128);"><strong>{{ SpecName("CSS3 Namespaces", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Namespaces") }} since September 29th, 2011</td>
</tr>
<tr>
<td colspan="2">
<p>Adds the support for the XML Namespaces by defining the notion of <em>CSS qualified name</em>, using the ' <code>|</code> ' syntax and adding the {{ cssxref("@namespace") }} CSS at-rule.</p>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width: 30%; background-color:rgb(128,255,128);"><strong>{{ SpecName("CSS3 Media Queries", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Media Queries") }} since June 19th, 2012</td>
</tr>
<tr>
<td colspan="2">
<p>Extends the former media type ( <code>print</code>, <code>screen</code>, <code>…</code> ) to a full language allowing <a href="/en/CSS/Media_queries" title="en/CSS/Media_queries">queries on the device media capabilities</a> like <code>only screen and (color)</code> .</p>
<p>Media queries are not only used in CSS document but also in some attributes of HTML Elements, like the {{ htmlattrxref("media","link") }} attribute of the {{ HTMLElement("link") }} element.</p>
</td>
</tr>
</tbody>
</table>
<p>The <a href="https://dev.w3.org/csswg/mediaqueries4" title="https://dev.w3.org/csswg/mediaqueries4">next iteration of this specification</a> is in the work, allowing to tailor a Web site regarding the input methods available on the user agent, with new media features like <code>hover</code> or <code>pointer</code>. Detection of EcmaScript support, using the <code>script</code> media features is also proposed.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(128,255,128);"><strong>{{ SpecName("CSS3 Style", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Style") }} since November 7th, 2013</td>
</tr>
<tr>
<td colspan="2">Formally defines the syntax of the content of the HTML <a href="/en/HTML/Global_attributes#attr-style" title="en/HTML/Global_attributes#attr-style"> <code>style</code> </a> global attribute.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Backgrounds", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Backgrounds") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Adds:</p>
<ul>
<li>Support, on backgrounds, for any type of {{ xref_cssimage() }}, and not only for <code>uri()</code> defined ones.</li>
<li>Support for multiple background images.</li>
<li>The {{ cssxref("background-repeat") }} <code>space</code> and <code>round</code> values, and for the 2-value syntax of this CSS property.</li>
<li>The {{ cssxref("background-attachment") }} <code>local</code> value.</li>
<li>The CSS {{ cssxref("background-origin") }}, {{ cssxref("background-size") }}, and {{ cssxref("background-clip") }} properties.</li>
<li>Support for curved border corners, with the CSS {{ cssxref("border-radius") }}, {{ cssxref("border-top-left-radius") }}, {{ cssxref("border-top-right-radius") }}, {{ cssxref("border-bottom-left-radius") }}, and {{ cssxref("border-bottom-right-radius") }} properties.</li>
<li>Support for the use of an {{ xref_cssimage() }} as the border with the CSS {{ cssxref("border-image") }}, {{ cssxref("border-image-source") }}, {{ cssxref("border-image-slice") }}, {{ cssxref("border-image-width") }}, {{ cssxref("border-image-outset") }}, and {{ cssxref("border-image-repeat") }} properties.</li>
<li>Support for shadows of the element with the CSS {{ cssxref("box-shadow") }} property.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>The <a class="external" href="https://dev.w3.org/csswg/css4-background/" title="https://dev.w3.org/csswg/css4-background/">CSS4 iteration of the Backgrounds and Borders specification</a> is already in progress, though it still hasn't reached the First Public Working Draft stage, it plans to add the ability to clip a border (with the CSS {{ cssxref("border-clip") }}, {{ cssxref("border-clip-top") }}, {{ cssxref("border-clip-right") }}, {{ cssxref("border-clip-bottom") }}, and {{ cssxref("border-clip-left") }} properties) or to control the shape of the border in a corner (using the CSS {{ cssxref("border-corner-shape") }} property).</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Multicol", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Multicol") }}</td>
</tr>
<tr>
<td colspan="2">Adds support for easy multi-column layouts using the CSS {{ cssxref("columns") }}, {{ cssxref("column-count") }}, {{ cssxref("column-fill") }}, {{ cssxref("column-gap") }}, {{ cssxref("column-rule") }}, {{ cssxref("column-rule-color") }}, {{ cssxref("column-rule-style") }}, {{ cssxref("column-rule-width") }}, {{ cssxref("column-span") }}, {{ cssxref("column-width") }}, {{ cssxref("break-after") }}, {{ cssxref("break-before") }}, and {{ cssxref("break-inside") }}.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Speech", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Speech") }}</td>
</tr>
<tr>
<td colspan="2">Defines the <code>speech</code> media type, an aural formatting model and numerous properties specific for speech-rendering user agents.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Images", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Images") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Defines the {{ xref_cssimage() }} data type.</p>
<p>Extends the <code>url()</code> syntax to support image slices using media fragments.</p>
<p>Adds:</p>
<ul>
<li>The <code>dppx</code> unit to the {{ xref_cssresolution() }} data type.</li>
<li>The <code>image()</code> function as a more flexible alternative to <code>url()</code> to define an image from an url.<br />
<em><strong>At risk</strong> </em> <strong> <em>:</em> </strong> <em> due to insufficient browser support, standardization of the <code>image()</code> function may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
<li>Support for <code>linear-gradient()</code>, <code>repeating-linear-gradient()</code>, <code>radial-gradient()</code> and <code>repeating-radial-gradient()</code>.</li>
<li>The ability to define how a replaced element should fit in its element, using the CSS {{ cssxref("object-fit") }} property.<br />
<em><strong>At risk</strong> </em> <strong> <em>:</em> </strong> <em> due to insufficient browser support, standardization of the {{ cssxref("object-fit") }} and property may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
<li>The ability to override the resolution and orientation of an external image using the CSS {{ cssxref("image-resolution") }} and {{ cssxref("image-orientation") }} properties.<br />
<em><strong>At risk</strong> </em> <strong> <em>:</em> </strong> <em> due to insufficient browser support, standardization of the {{ cssxref("image-resolution") }} and {{ cssxref("image-orientation") }} properties may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>The <a href="#Images_(Level_4)">CSS Image Values and Replaced Content Level 4</a> which will supersede CSS Image Level 3 is in development and is a {{Spec2("CSS4 Images")}}.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width: 30%; background-color: rgb(220, 255, 220);"><strong>{{ SpecName("CSS3 Values", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Values") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Makes <code>initial</code> and <code>inherit</code> keywords usable on any CSS property.</p>
<p>Formally defines the CSS data types of CSS 2.1, that were implicitely defined by their grammar token and some textual precisions.</p>
<p>Adds:</p>
<ul>
<li>Definition for new font-relative length units: <code>rem</code> and <code>ch</code> .</li>
<li>Definition for viewport-relative length units: <code>vw</code>, <code>vh</code>, <code>vmax</code>, and <code>vmin</code> .</li>
<li>Precision about the real size of the absolute length units, which are not really absolute, but defined in relation with the <em>reference pixel</em> .</li>
<li>Definition for {{ xref_cssangle() }}, {{ xref_csstime() }}, {{ xref_cssfrequency() }}, {{ xref_cssresolution() }}.</li>
<li>Normative value to the definition of {{ xref_csscolorvalue() }}, {{ xref_cssimage() }}, and {{ xref_cssposition }}.</li>
<li>Definition for the {{ cssxref("calc", "calc()") }}, {{ cssxref("attr", "attr()")}}, and <code>toggle()</code> functional notations.<br />
<em><strong>At risk:</strong> due to insufficient browser support, standardization of the <code>calc()</code>, <code>attr()</code>, and <code>toggle()</code> functional notations may be postponed to </em> <em>the next iteration of this module</em><em>.</em></li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>Several types definition, like <code><ident></code> and <code><custom-ident></code>, have been deferred to CSS Values and Units Module Level 4.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Flexbox", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Flexbox") }}</td>
</tr>
<tr>
<td colspan="2">Add a flexbox layout to the CSS {{ cssxref("display") }} property and several new CSS properties to control it: {{ cssxref("flex") }}, {{ cssxref("flex-align") }}, {{ cssxref("flex-direction") }}, {{ cssxref("flex-flow") }}, {{ cssxref("flex-item-align") }}, {{ cssxref("flex-line-pack") }}, {{ cssxref("flex-order") }}, {{ cssxref("flex-pack") }}, and {{ cssxref("flex-wrap") }}.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220, 255, 220);"><strong>{{ SpecName("CSS3 Conditional", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Conditional") }}</td>
</tr>
<tr>
<td colspan="2">Adds features for conditional processing of parts of style sheets, conditioned on capabilities of the browser or the document the style sheet is being applied to. It consists mainly in allowing nested at-rules inside {{ cssxref("@media") }} and the adding of a new CSS at-rule, {{ cssxref("@supports") }}, and a new DOM method {{domxref("CSS.supports()")}}.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220, 255, 220);"><strong>{{ SpecName("CSS3 Text Decoration", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Text Decoration") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Extends:</p>
<ul>
<li>the CSS {{ cssxref("text-decoration") }} property by making it a shorthand for the CSS {{ cssxref("text-decoration-line") }}, {{ cssxref("text-decoration-color") }}, and {{ cssxref("text-decoration-style") }} properties. And adds the {{ cssxref("text-decoration-skip") }}, and {{ cssxref("text-underline-position") }} properties.</li>
</ul>
<p>Adds:</p>
<ul>
<li>Support for East-Asian-script emphasis marks with the CSS {{ cssxref("text-emphasis") }}, {{ cssxref("text-emphasis-style") }}, {{ cssxref("text-emphasis-color") }}, and {{ cssxref("text-emphasis-position") }} properties.</li>
<li>Support for script shadows with the CSS {{ cssxref("text-shadow") }} property.</li>
</ul>
<p>Precises:</p>
<ul>
<li>The paint order of the decorations.</li>
</ul>
<p><em><strong>At risk:</strong> due to insufficient browser support, standardization of the <code>text-decoration-skip</code>, line positioning rules and the ability to place both emphasis marks and ruby above the same base text may be postponed to </em> <em>the next iteration of this module</em><em>.</em></p>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Fonts", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Fonts") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Amends the CSS2.1 Font matching algorithm to be closer to what is really implemented.</p>
<p>Adds:</p>
<ul>
<li>Support for downloadable fonts via the CSS {{ cssxref("@font-face") }} at-rule.</li>
<li>The control of the contextual inter-glyph spacing via the CSS {{ cssxref("font-kerning") }} property.</li>
<li>The choice of language-specific glyphs via the CSS {{ cssxref("font-language-override") }} property.</li>
<li>The choice of glyphs with specific OpenType features via the CSS {{ cssxref("font-feature-settings") }} property.</li>
<li>The control of the aspect ratio to use when fallback fonts are selected via the CSS {{ cssxref("font-size-adjust") }} property.</li>
<li>The choice of alternative font faces using the CSS {{ cssxref("font-stretch") }}, {{ cssxref("font-variant-alternates") }}, {{ cssxref("font-variant-caps") }}, {{ cssxref("font-variant-east-asian") }}, {{ cssxref("font-variant-ligatures") }}, {{ cssxref("font-variant-numeric") }}, and {{ cssxref("font-variant-position") }} properties. It also extends the related CSS {{ cssxref("font-variant") }} shorthand property and introduces the {{ cssxref("@font-feature-values") }} at-rule.</li>
<li>The control of the automatic generation of an oblique or bold face when none are found via the CSS {{ cssxref("font-synthesis") }} property.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Cascade", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Cascade") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Adds:</p>
<ul>
<li>The <code>initial</code>, <code>unset</code> values for properties.</li>
<li>The CSS {{ cssxref("all") }} property.</li>
<li>The scoping mechanism.</li>
</ul>
<p>Precises:</p>
<ul>
<li>Interaction of media-dependent @import statements and style sheet loading requirements.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS3 Writing Modes", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Writing Modes") }}</td>
</tr>
<tr>
<td colspan="2">Defines the writing modes of both horizontal and vertical scripts and precises how the CSS {{ cssxref("direction") }} and {{ cssxref("unicode-bidi") }} properties interact with the new CSS {{ cssxref("text-orientation") }} property, and extends them where needed.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS Shapes", "", "") }}</strong></td>
<td>{{ Spec2("CSS Shapes") }}</td>
</tr>
<tr>
<td colspan="2">Defines geometric shapes, which can be applied to floats. These shapes describe areas, around which inline content wraps instead of wrapping around the bounding box.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(220,255,220);"><strong>{{ SpecName("CSS Masks", "", "") }}</strong></td>
<td>{{ Spec2("CSS Masks") }}</td>
</tr>
<tr>
<td colspan="2">Defines a way for partially or fully hiding portions of visual elements. It describes how to use another graphical element or image as a luminance or alpha mask.</td>
</tr>
</tbody>
</table>
<h3 id="Modules_in_the_refining_phase">Modules in the refining phase</h3>
<p>Specifications that are deemed to be in the <em>refining phase</em> are already fairly stable. Though changes are still expected, they shouldn't create incompatibilities with current implementations; they should mainly define behavior in edge cases.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("Web Animations", "", "") }}</strong></td>
<td>{{ Spec2("Web Animations") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Counter Styles", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Counter Styles") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("Compositing", "", "") }}</strong></td>
<td>{{ Spec2("Compositing") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Syntax", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Syntax") }}</td>
</tr>
<tr>
<td colspan="2">Precises how charsets are determined; minor changes in parsing and tokenization algorithms.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS Will Change", "", "") }}</strong></td>
<td>{{ Spec2("CSS Will Change") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Transitions", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Transitions") }}</td>
</tr>
<tr>
<td colspan="2">Allows the definition of transitions effects between two properties values by adding the CSS {{ cssxref("transition") }}, {{ cssxref("transition-delay") }}, {{ cssxref("transition-duration") }}, {{ cssxref("transition-property") }}, and {{ cssxref("transition-timing-function") }} properties.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Animations", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Animations") }}</td>
</tr>
<tr>
<td colspan="2">Allows the definition of animations effects by adding the CSS {{ cssxref("animation") }}, {{ cssxref("animation-delay") }},{{ cssxref("animation-direction") }}, {{ cssxref("animation-duration") }}, {{ cssxref("animation-fill-mode") }}, {{ cssxref("animation-iteration-count") }}, {{ cssxref("animation-name") }}, {{ cssxref("animation-play-state") }}, and {{ cssxref("animation-timing-function") }} properties, as well as the {{ cssxref("@keyframes") }} at-rule.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Transforms", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Transforms") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Adds:</p>
<ul>
<li>the support of bi-dimensional transforms to be applied to any element using the CSS {{ cssxref("transform") }} and {{ cssxref("transform-origin") }} properties. The supported transforms are: <code>matrix</code><code>()</code>, <code>translate()</code>, <code>translateX()</code>, <code>translateY()</code>, <code>scale()</code>, <code>scaleX()</code>, <code>scaleY()</code>, <code>rotate()</code>, <code>skewX()</code>, and <code>skewY()</code>.</li>
<li>the support of tri-dimensional transforms to be applied to any element by adding the CSS {{ cssxref("transform-style") }}, {{ cssxref("perspective") }}, {{ cssxref("perspective-origin") }}, and {{ cssxref("backface-visibility") }} properties and extended the {{ cssxref("transform") }} property with the following transforms are: <code>matrix</code> <code>3d()</code>, <code>translate3d()</code>, <code>translateZ()</code>, <code>scale3d()</code>, <code>scaleZ()</code>, <code>rotate3d()</code>, <code>rotateX</code><code>()</code>, <code>rotateY</code><code>()</code>, <code>rotateZ()</code>, and <code>perspective()</code>.</li>
</ul>
<p><em><strong>Note:</strong> this specification is a merge of CSS 2D-Transforms, CSS 3D-Transforms and SVG transforms. </em></p>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width: 30%; background-color: rgb(255, 255, 220);"><strong>{{ SpecName("CSS3 Fragmentation", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Fragmentation") }}</td>
</tr>
<tr>
<td colspan="2">Defines how partitions of a Web page should happen, that is page, column breaks, and widows and orphans handling.
<p>Adds:</p>
<ul>
<li>Support for defining the behavior of decorations, that is borders and background colors or images, when a box is breaked (at a page, column or line-break) with the CSS {{ cssxref("box-decoration-break") }} property.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Text", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Text") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Extends:</p>
<ul>
<li>the CSS {{ cssxref("text-transform") }} property with the value <code>full-width</code>.</li>
<li>the CSS {{ cssxref("text-align") }} property with the value <code>start</code>, <code>end</code>, <code>start end</code>, and <code>match-parent</code> for a better support of documents with multiple directionalities of text.</li>
<li>the CSS {{ cssxref("text-align") }} property with a {{ xref_cssstring() }} value to align on that character. This is useful to align number on the decimal point.</li>
<li>the CSS {{ cssxref("word-spacing") }} and {{ cssxref("letter-spacing") }} properties with range constraints to control flexibility in justification.</li>
</ul>
<p>Adds:</p>
<ul>
<li>Control on how whitespaces are displayed using the CSS {{ cssxref("text-space-collapse") }} and {{ cssxref("tab-size") }} properties.</li>
<li>Control on line breaks and word boundaries using the CSS {{ cssxref("line-break") }}, {{ cssxref("word-break") }}, {{ cssxref("hyphens") }}, {{ cssxref("text-wrap") }}, {{ cssxref("overflow-wrap") }}, and {{ cssxref("text-align-last") }} properties.</li>
<li>Control on how justification is happening, in order to support more type of scripts, using the CSS {{ cssxref("text-justify") }} property.</li>
<li>Control on edge effect using the CSS {{ cssxref("text-indent") }} and {{ cssxref("hanging-punctuation") }} properties.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>A few features present in early CSS Text Level 3 draft have being <a class="external" href="https://dev.w3.org/csswg/css3-text/#recent-changes" title="https://dev.w3.org/csswg/css3-text/#recent-changes">postponed to the next iteration of this module</a> .</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("CSS3 Variables", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Variables") }}</td>
</tr>
<tr>
<td colspan="2">Defines a mechanism allowing to define variables in CSS.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,255,220);"><strong>{{ SpecName("Compositing", "", "") }}</strong></td>
<td>{{ Spec2("Compositing") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<h3 id="Modules_in_the_revising_phase">Modules in the revising phase</h3>
<p>Modules that are in the revising phase are much less stable than those in the refining phase. Often the syntax is still under scrutiny and may evolve a lot, in a non-compatible way. Alternative syntaxes are tested and often implemented.</p>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,160,100);"><strong>{{ SpecName("CSS3 Basic UI", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Basic UI") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Adds:</p>
<ul>
<li>The ability to tweak the box model using the CSS {{ cssxref("box-sizing") }} property.<br />
<strong><em>At risk:</em> </strong> <em> due to insufficient browser support, standardization of the <code>padding</code><code>-box</code> value may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
<li>Allow the styling of forms according their content using the CSS {{ cssxref(":indeterminate") }}, {{ cssxref(":default") }}, {{ cssxref(":valid") }}, {{ cssxref(":invalid") }}, {{ cssxref(":in-range") }}, {{ cssxref(":out-of-range") }}, {{ cssxref(":required") }}, {{ cssxref(":optional") }}, {{ cssxref(":read-only") }}, and {{ cssxref(":read-write") }} pseudo-classes and the {{ cssxref("::value") }}, {{ cssxref("::choices") }}, {{ cssxref("::repeat-item") }}, and {{ cssxref("::repeat-index") }} pseudo-elements.<br />
<em><strong>At risk:</strong> due to insufficient browser support, standardization of the pseudo-elements {{ cssxref("::value") }}, {{ cssxref("::choices") }}, {{ cssxref("::repeat-item") }}, and {{ cssxref("::repeat-index") }} may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
<li>Support for icons, defined by the CSS {{ cssxref("icon") }} property simultaneously with the new <code>icon</code> value of the CSS {{ cssxref("content") }} property.<br />
<em><strong>At risk:</strong> due to insufficient browser support, standardization of the {{ cssxref("icon") }} property and the <code>icon</code> value may be postponed to CSS4. </em></li>
<li>Support for the CSS {{ cssxref("outline-offset") }} property giving more control on the position of the outline.</li>
<li>Support for the CSS {{ cssxref("resize") }} property allowing Web authors to control if and how elements should be resized.</li>
<li>Support for the CSS {{ cssxref("text-overflow") }} property defining how text overflows, if needed.<br />
<em><strong>At risk:</strong> due to insufficient browser support, the 2-value syntax of this property as well as the support for {{ xref_cssstring() }} values may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
<li>The ability to define the hotspot of a cursor as well as the new <code>none</code>, <code>context-menu</code>, <code>cell</code>, <code>vertical-text</code>, <code>alias</code>, <code>copy</code>, <code>no-drop</code>, <code>not-allowed</code>, <code>nesw-</code><code>resize</code>, <code>nwse-</code><code>resize</code>, <code>col-resize</code>, <code>row-resize</code>, <code>all-scroll</code>, <code>zoom-in</code>, <code>zoom-out</code>, extending the {{ cssxref("cursor") }} property.</li>
<li>The ability to specify the sequential navigation order (that is the <em>tabbing order</em> ) using the CSS {{ cssxref("nav-index") }}, {{ cssxref("nav-up") }}, {{ cssxref("nav-right") }}, {{ cssxref("nav-left") }}, {{ cssxref("nav-down") }} properties.<br />
<em><strong>At risk:</strong> due to insufficient browser support, standardization of the navigation properties may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
<li>The ability to control the usage of an IME editor, using the CSS {{ cssxref("ime-mode") }} property.<br />
<em><strong>At risk:</strong> due to insufficient browser support, standardization of the {{ cssxref("ime-mode") }} property may be postponed to </em> <em>the next iteration of this module</em> <em>.</em></li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>An early list of what could be in the next iteration of the CSS Basic User Interface Module is <a class="external" href="https://wiki.csswg.org/spec/css4-ui" title="https://wiki.csswg.org/spec/css4-ui">available</a>.</p>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,160,100);"><strong>{{ SpecName("CSS3 Grid", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Grid") }}</td>
</tr>
<tr>
<td colspan="2">Add a grid layout to the CSS <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/display" title=""><code>display</code></a> property and several new CSS properties to control it: {{cssxref("grid")}}, {{cssxref("grid-area")}}, {{cssxref("grid-auto-columns")}}, {{cssxref("grid-auto-flow")}}, {{cssxref("grid-auto-position")}}, {{cssxref("grid-auto-rows")}}, {{cssxref("grid-column")}}, {{cssxref("grid-column-start")}}, {{cssxref("grid-column-end")}}, {{cssxref("grid-row")}}, {{cssxref("grid-row-start")}}, {{cssxref("grid-row-end")}}, {{cssxref("grid-template")}}, {{cssxref("grid-template-areas")}}, {{cssxref("grid-template-rows")}}, and {{cssxref("grid-template-columns")}}.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,160,100);"><strong>{{ SpecName("CSS3 Box Alignment", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Box Alignment") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,160,100);"><strong>{{ SpecName("CSS3 Paged Media", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Paged Media") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,160,100);"><strong>{{ SpecName("CSSOM View", "", "") }}</strong></td>
<td>{{ Spec2("CSSOM View") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:rgb(255,160,100);"><strong>{{ SpecName("CSS4 Selectors", "", "") }}</strong></td>
<td>{{ Spec2("CSS4 Selectors") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<h3 id="Modules_in_the_exploring_phase">Modules in the exploring phase</h3>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width: 30%; background-color: #F66;"><strong>{{ SpecName("CSS4 Images", "", "") }}</strong></td>
<td>{{ Spec2("CSS4 Images") }}</td>
</tr>
<tr>
<td colspan="2">
<p>Extends:</p>
<ul>
<li>the <code>image()</code> functional notation to describe the directionality of the image (<code>rtl</code> or <code>ltr</code>), allowing for bidi-sensitive images.</li>
<li>the {{ cssxref("image-orientation") }} property by adding the keyword <code>from-image</code>, allowing to follow EXIF data stored into images to be considered.</li>
</ul>
<p>Adds:</p>
<ul>
<li>the <code>image-set()</code> functional notation to allow the definition to equivalent images at different resolution allowing for resolution-negotiated selection of images.</li>
<li>the <code>element()</code> functional notation allowing the use of part of the page as image.</li>
<li>the <code>cross-fade()</code> functional notation allowing to refer to intermediate images when transitioning between two images and defines the interpolation between two images.</li>
<li>the <code>conic-gradient()</code> and <code>repeating-conic-gradient()</code> functional notation describing a new type of gradient.</li>
<li>the {{cssxref("image-rendering")}} property that allow to define how resize of the object should be handled.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Device", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Device") }}</td>
</tr>
<tr>
<td colspan="2">Adds a new at-rule, {{ cssxref("@viewport") }}, allowing to specify the size, zoom factor, and orientation of the viewport that is used as the base for the initial containing block.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 GCPM", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 GCPM") }}</td>
</tr>
<tr>
<td colspan="2">Adds the ability to tailor printed version of a document by allowing to control header, footer but also references tables like indexes or tables of content.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS Exclusions", "", "") }}</strong></td>
<td>{{ Spec2("CSS Exclusions") }}</td>
</tr>
<tr>
<td colspan="2">Extends the floats mechanism to define exclusion regions in any positioning scheme. Adds the notion of shapes, in which content must flows.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Lists", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Lists") }}</td>
</tr>
<tr>
<td colspan="2">Extends the list counter mechanism so that list markers can be styled and Web developers can define new list counter schemes.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Regions", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Regions") }}</td>
</tr>
<tr>
<td colspan="2">Defines a new mechanism allowing content to flow across, eventually non-contiguous, multiple areas called regions.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Device", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Device") }}</td>
</tr>
<tr>
<td colspan="2">Adds a new at-rule, {{ cssxref("@viewport") }}, allowing to specify the size, zoom factor, and orientation of the viewport that is used as the base for the initial containing block.</td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("Filters 1.0", "", "") }}</strong></td>
<td>{{ Spec2("Filters 1.0") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Template", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Template") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Sizing", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Sizing") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS Line Grid", "", "") }}</strong></td>
<td>{{ Spec2("CSS Line Grid") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Positioning", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Positioning") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Ruby", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Ruby") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSSOM", "", "") }}</strong></td>
<td>{{ Spec2("CSSOM") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Overflow", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Overflow") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Font Loading", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Font Loading") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Display", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Display") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS Scope", "", "") }}</strong></td>
<td>{{ Spec2("CSS Scope") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS4 Media Queries", "", "") }}</strong></td>
<td>{{ Spec2("CSS4 Media Queries") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS Non-element Selectors", "", "") }}</strong></td>
<td>{{ Spec2("CSS Non-element Selectors") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("Geometry Interfaces", "", "") }}</strong></td>
<td>{{ Spec2("Geometry Interfaces") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F66;"><strong>{{ SpecName("CSS3 Inline", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Inline") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<h3 id="Modules_in_the_rewriting_phase">Modules in the rewriting phase</h3>
<p>Modules that are in the rewriting phase are outdated and require to be rewritten. The syntax is still under scrutiny and may evolve a lot, in a non-compatible way. Alternative syntaxes are tested and often implemented.</p>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F33;"><strong>{{ SpecName("CSS3 Box", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Box") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F33;"><strong>{{ SpecName("CSS3 Content", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Content") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<table class="fullwidth-table" style="width:100%">
<tbody>
<tr>
<td style="width:30%; background-color:#F33;"><strong>{{ SpecName("CSS3 Inline Layout", "", "") }}</strong></td>
<td>{{ Spec2("CSS3 Inline Layout") }}</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</tbody>
</table>
<p> </p>
Formally, there is no CSS3 standard per se . Each module being standardized independently, the standard CSS consists of CSS2.1 amended and extended by the completed modules, not necessary all with the same level number. At each point of time, a snapshot of the CSS standard can be defined, listing CSS2.1 and the mature modules.