csswg-drafts/css-shapes-2/Overview.html at 12f125ad61d98a5a78dd03acebf531c90331ebb9 · w3c/csswg-drafts · GitHub

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">

<html lang=en>
 <head
  profile="http://dublincore.org/documents/2008/08/04/dc-html/ http://www.w3.org/2006/03/hcard">
  <meta content="text/html; charset=utf-8" http-equiv=Content-Type>
  <title>CSS Shapes Module Level 2</title>

  <link href="http://purl.org/dc/terms/" rel=schema.dcterms>
  <link href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
   rel=dcterms.rights>
  <meta content="CSS Shapes Module Level 2" name=dcterms.title>
  <meta content=text name=dcterms.type>
  <meta content=2014-03-17 name=dcterms.date>
  <meta content="Alan Stearns" name=dcterms.creator>
  <meta content=W3C name=dcterms.publisher>
  <meta content="http://dev.w3.org/csswg/www-style/" name=dcterms.identifier><!--<script src='http://test.csswg.org/harness/annotate.js#css-shapes_DEV' type='text/javascript' defer></script>-->

  <link href="../shared/style/default.css" rel=stylesheet type="text/css">
  <style type="text/css">
    .singleImgExample {
    	display: block;
    	margin: auto;
    }

    .example-table {
    	table-layout: fixed;
    	width: 100%;
    }

    .example-table tr td img {
    	width: 90%;
    }
  </style>
  <link href=issues.css rel=stylesheet type="text/css">
  <link href="http://www.w3.org/StyleSheets/TR/W3C-ED.css" rel=stylesheet
   type="text/css">
  <link href="../shared/style/alternate-spec-style.css" id=st rel=stylesheet
   title="alternate spec style" type="text/css">

 <body>
  <div class=head id=div-head> <!--begin-logo-->
   <p><a href="http://www.w3.org/"><img alt=W3C height=48
    src="http://www.w3.org/Icons/w3c_home" width=72></a> <!--end-logo-->

   <h1 id=css-shapes-module>CSS Shapes Module Level 2</h1>

   <h2 class="no-num no-toc">Editor's Draft 17 March 2014</h2>

   <dl>
    <dt>This version:

    <dd><a
     href="http://dev.w3.org/csswg/www-style/">http://dev.w3.org/csswg/www-style/</a>

    <dt>Latest version:

    <dd><a
     href="http://dev.w3.org/csswg/www-style/">http://dev.w3.org/csswg/www-style/</a>

    <dt>Editor's Draft:

    <dd><a
     href="http://dev.w3.org/csswg/www-style/">http://dev.w3.org/csswg/www-style/</a>

    <dt>Previous version:

    <dd>None

    <dt>Editors:

    <dd class=vcard><span class=fn>Alan Stearns</span>, <span class=org>Adobe
     Systems, Inc.</span>, <span class=email>stearns@adobe.com</span></dd>
    <!--<dt>Issues List:</dt>
      <dd><a href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&amp;product=CSS&amp;component=Shapes&amp;resolution=---&amp;cmdtype=doit">in Bugzilla</a></dd>-->

    <dt>Feedback:

    <dd><a
     href="mailto:www-style@w3.org?subject=%5B[css-shapes]%5D%20feedback">www-style@w3.org</a>
     with subject line “<kbd>[css-shapes] <var>… message topic
     …</var></kbd>” (<a
     href="http://lists.w3.org/Archives/Public/www-style/"
     rel=discussion>archives</a>)
   </dl>
   <!--begin-copyright-->
   <p class=copyright><a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
    rel=license>Copyright</a> © 2014 <a href="http://www.w3.org/"><abbr
    title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a
    href="http://www.csail.mit.edu/"><abbr
    title="Massachusetts Institute of Technology">MIT</abbr></a>, <a
    href="http://www.ercim.eu/"><abbr
    title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
    <a href="http://www.keio.ac.jp/">Keio</a>, <a
    href="http://ev.buaa.edu.cn/">Beihang</a>), All Rights Reserved. W3C <a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
    <a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a>
    and <a
    href="http://www.w3.org/Consortium/Legal/copyright-documents">document
    use</a> rules apply.</p>
   <!--end-copyright-->
   <hr title="Separator for header">
  </div>

  <h2 class="no-num no-toc" id=abstract>Abstract</h2>

  <p>This draft contains the features of CSS relating to wrapping content
   around and inside shapes. It (implicitly for now) includes and extends the
   functionality of CSS Shapes Level 1 <a href="#ref-CSS-SHAPES"
   rel=biblioentry>[CSS-SHAPES]<!--{{CSS-SHAPES}}--></a>. The main points of
   extension compared to level 1 include additional ways of defining shapes,
   defining an exclusion area using a shape, and restricting an element's
   content area using a shape.

  <h2 class="no-num no-toc" id=status>Status of this document</h2>
  <!--begin-status-->

  <p>This is a public copy of the editors' draft. It is provided for
   discussion only and may change at any moment. Its publication here does
   not imply endorsement of its contents by W3C. Don't cite this document
   other than as work in progress.

  <p>The (<a
   href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public
   mailing list <a
   href="mailto:www-style@w3.org?Subject=%5Bwww-style%5D%20PUT%20SUBJECT%20HERE">
   www-style@w3.org</a> (see <a
   href="http://www.w3.org/Mail/Request">instructions</a>) is preferred for
   discussion of this specification. When sending e-mail, please put the text
   “www-style” in the subject, preferably like this:
   “[<!---->www-style<!---->] <em>…summary of comment…</em>”

  <p>This document was produced by the <a
   href="http://www.w3.org/Style/CSS/members">CSS Working Group</a> (part of
   the <a href="http://www.w3.org/Style/">Style Activity</a>).

  <p>This document was produced by a group operating under the <a
   href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February
   2004 W3C Patent Policy</a>. W3C maintains a <a
   href="http://www.w3.org/2004/01/pp-impl/32061/status"
   rel=disclosure>public list of any patent disclosures</a> made in
   connection with the deliverables of the group; that page also includes
   instructions for disclosing a patent. An individual who has actual
   knowledge of a patent which the individual believes contains <a
   href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
   Claim(s)</a> must disclose the information in accordance with <a
   href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
   6 of the W3C Patent Policy</a>.</p>
  <!--end-status-->

  <h2 class="no-num no-toc" id=contents>Table of contents</h2>
  <!--begin-toc-->

  <ul class=toc>
   <li><a href="#intro"><span class=secno>1. </span>Introduction</a>

   <li><a href="#terminology"><span class=secno>2. </span>Terminology</a>

   <li><a href="#shapes"><span class=secno>3. </span>Shapes</a>
    <ul class=toc>
     <li><a href="#basic-shapes-from-svg-syntax"><span class=secno>3.1.
      </span>Basic Shapes</a>

     <li><a href="#referencing-svg-shapes"><span class=secno>3.2.
      </span>Referencing SVG shapes </a>

     <li><a href="#shapes-from-image"><span class=secno>3.3. </span>Shapes
      from Image</a>

     <li><a href="#declaring-shapes"><span class=secno>3.4. </span>Declaring
      Shapes</a>
      <ul class=toc>
       <li><a href="#shape-outside-property"><span class=secno>3.4.1.
        </span>The ‘<code class=property>shape-outside</code>’
        Property</a>

       <li><a href="#shape-inside-property"><span class=secno>3.4.2.
        </span>The ‘<code class=property>shape-inside</code>’
        Property</a>

       <li><a href="#shape-image-threshold-property"><span class=secno>3.4.3.
        </span>The ‘<code class=property>shape-image-threshold</code>’
        Property</a>

       <li><a href="#shape-image-source-type-property"><span
        class=secno>3.4.4. </span>The ‘<code
        class=property>shape-image-source-type</code>’ Property</a>

       <li><a href="#shape-margin-property"><span class=secno>3.4.5.
        </span>The ‘<code class=property>shape-margin</code>’
        property</a>

       <li><a href="#shape-padding-property"><span class=secno>3.4.6.
        </span>The ‘<code class=property>shape-padding</code>’
        Property</a>
      </ul>
    </ul>

   <li><a href="#conformance"><span class=secno>4. </span>Conformance</a>

   <li class=no-num><a href="#acknowledgments">Acknowledgments</a>

   <li class=no-num><a href="#references">References</a>
    <ul class=toc>
     <li class=no-num><a href="#normative-references">Normative
      references</a>

     <li class=no-num><a href="#other-references">Other references</a>
    </ul>

   <li class=no-num><a href="#index">Index</a>

   <li class=no-num><a href="#property-index">Property index</a>

   <li class=no-num><a href="#change-log">Change Log</a>
  </ul>
  <!--end-toc-->

  <h2 id=intro><span class=secno>1. </span>Introduction</h2>

  <p><em>This section is not normative.</em>

  <p> Level 1 of this specification defined properties to control the
   geometry of an element's <a href="#float-area">float area</a>. This level
   defines how shapes apply to exclusions. It also includes a ‘<a
   href="#shape-inside"><code class=property>shape-inside</code></a>’
   property for applying a shape to an element's content area. And finally it
   defines new ways of specifying shapes for all of these applications.

  <h2 id=terminology><span class=secno>2. </span>Terminology</h2>

  <p><dfn id=exclusion-area>Exclusion area</dfn>

  <p> The area used for excluding inline flow content around an exclusion
   box. The <a href="#exclusion-area">exclusion area</a> is equivalent to the
   <a href="http://www.w3.org/TR/CSS2/box.html#box-dimensions">border box</a>
   for an exclusion box. This specification's ‘<code
   class=property>shape-outside</code>’ property can be used to define
   arbitrary, non-rectangular <a href="#exclusion-area">exclusion areas</a>.
   The ‘<a href="#shape-inside"><code
   class=property>shape-inside</code></a>’ property also defines an <a
   href="#exclusion-area">exclusion area</a>, but in this case it is the area
   outside the shape that inline content avoids.

  <p><dfn id=float-area>Float area</dfn>

  <p> The area used for wrapping content around a float element. By default,
   the float area is the float element's <a
   href="http://www.w3.org/TR/CSS2/box.html#box-dimensions">margin box</a>.
   This specification's ‘<code class=property>shape-outside</code>’
   property can be used to define arbitrary, non-rectangular float areas.

  <p><dfn id=content-area>Content area</dfn>

  <p> The <a href="http://www.w3.org/TR/CSS2/box.html#box-dimensions">content
   area</a> is normally used for layout of the inline flow content of a box.

  <div class=issue-marker data-bug_id=15089 data-bug_status=NEW> <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15089">Issue-15089</a>

   <div class=issue-details>
    <p class=short-desc>shrink-to-fit circle / shape
   </div>
  </div>

  <h2 id=shapes><span class=secno>3. </span>Shapes</h2>

  <p> Shapes define arbitrary geometric contours around which inline content
   flows. The shape-outside property defines the <a href="#float-area">float
   area</a> for a float, and the exclusion area for an exclusion.

  <h3 id=basic-shapes-from-svg-syntax><span class=secno>3.1. </span>Basic
   Shapes</h3>

  <p>Add the final <a
   href="http://www.w3.org/TR/css-shapes/#basic-shapes-from-svg-syntax">level
   1</a> section with a possible addition of path() and a rejiggered
   rectangle().

  <dl>
   <dt><dfn id=rectangle>rectangle()</dfn> = rectangle( &lt;<shape-arg>>{4} [
    round &lt;&lt;‘<code class=property>border-radius</code>’>> ]? )
    </shape-arg>

   <dd>
    <ul>
     <li> The first four arguments represent <strong>x, y, width</strong> and
      <strong>height</strong> of the rectangle. Negative values for width and
      height are invalid.

     <li> The optional &lt;&lt;‘<code
      class=property>border-radius</code>’>> argument(s) define rounded
      corners for the rectangle using the ‘<code
      class=property>border-radius</code>’ shorthand syntax.
    </ul>
  </dl>

  <div class="issue-marker wrapper">
   <div class=issue-marker data-bug_id=16448 data-bug_status=ASSIGNED> <a
    href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=16448">Issue-16448</a>

    <div class=issue-details>
     <p class=short-desc>Should we revisit the decision to not allow SVG path
      syntax in the shape-inside, shape-outside properties
    </div>
   </div>
  </div>

  <h3 id=referencing-svg-shapes><span class=secno>3.2. </span>Referencing SVG
   shapes</h3>

  <p>An SVG shape can be referenced using the <code>url()</code> syntax. The
   shape can be any of the <a href="http://www.w3.org/TR/SVG/shapes.html">SVG
   basic shapes</a> or a <a href="http://www.w3.org/TR/SVG/paths.html">path
   element</a>.

  <div class=example>
   <div style="float:right"> <img alt="results of referencing SVG shapes"
    src="images/svg-shape-reference.png"></div>
   <code class=html></code>
   <pre>
&lt;style&gt;
div {
    height: 400px;
    width: 400px;
}
.in-a-circle {
    shape-outside: url(#circle_shape);
}

.in-a-path {
    shape-outside: url(#path-shape);
}

&lt;/style&gt;

&lt;svg ...&gt;
&lt;circle id="circle_shape" cx="50%" cy="50%" r="50%" /&gt;
&lt;path id="path-shape" d="M 100 100 L 300 100 L 200 300 z" /&gt;
&lt;/svg&gt;

&lt;div class="around-a-circle"&gt;...&lt;/div&gt;
&lt;div class="around-a-path"&gt;...&lt;/div&gt;
</pre>
  </div>
  <!-- End section "Shapes from SVG Syntax -->

  <h3 id=shapes-from-image><span class=secno>3.3. </span>Shapes from Image</h3>

  <p>Add the final <a
   href="http://www.w3.org/TR/css-shapes/#shapes-from-image">level 1</a>
   section. <!-- End section "Shapes from image" -->

  <p class=issue> One <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=16716">suggestion</a>
   is to define a shape based on an element's rendered content. This could
   have security implications.

  <p class=issue> Another <a
   href="http://lists.w3.org/Archives/Public/www-style/2014Mar/0120.html">suggestion</a>
   is to add something to an image() function that determines the relevant
   pixels to use (both for defining a shape and for display).

  <h3 id=declaring-shapes><span class=secno>3.4. </span>Declaring Shapes</h3>

  <p> A shape can be declared with the ‘<code
   class=property>shape-outside</code>’ property, with possible
   modifications from the ‘<code class=property>shape-margin</code>’
   property. The shape defined by the ‘<code
   class=property>shape-outside</code>’ and ‘<code
   class=property>shape-margin</code>’ properties changes the geometry of a
   float element's <a href="#float-area">float area</a> and an exclusion
   element's <a href="#exclusion-area">exclusion area</a>.

  <p> A shape can be declared with the ‘<a href="#shape-inside"><code
   class=property>shape-inside</code></a>’ property, with possible
   modifications from the ‘<a href="#shape-padding"><code
   class=property>shape-padding</code></a>’ property. The shape defined by
   the ‘<a href="#shape-inside"><code
   class=property>shape-inside</code></a>’ and ‘<a
   href="#shape-padding"><code class=property>shape-padding</code></a>’
   properties defines an <a href="#exclusion-area">exclusion area</a> that
   contributes to the element's <span>wrapping context</span>. The ‘<a
   href="#shape-inside"><code class=property>shape-inside</code></a>’
   property applies to all block-level elements.

  <div class=example>
   <p> The red box illustrates an exclusion element's content box, which is
    unmodified and subject to normal CSS positioning (here absolute
    positioning).

   <pre><code class=html>
&lt;style type="text/css"&gt;
  .exclusion  {
      wrap-flow: both;
      position: absolute;
      top: 25%;
      left: 25%;
      width: 50%;
      height: 50%;
      shape-outside: circle(50% at 50% 50%);
      border: 1px solid red;
  }
&lt;/style&gt;

&lt;div style=”position: relative;”&gt;
  &lt;div class=”exclusion”&gt;&lt;/div&gt;
  Lorem ipsum dolor sit amet...
&lt;/div&gt;
</code></pre>
   <img alt="Example rendering of circle shape and box model."
   class=singleImgExample src="images/shapes_CSS2.1_MBP.png"
   style="max-width:40%"></div>

  <h4 id=shape-outside-property><span class=secno>3.4.1. </span>The ‘<code
   class=property>shape-outside</code>’ Property</h4>

  <p>Add the final <a
   href="http://www.w3.org/TR/css-shapes/#shape-outside-property">level 1</a>
   section with the change that shape-outside applies to block-level elements
   and has an effect if the element is an exclusion.</p>
  <!-- End section "The shape-outside Property" -->

  <h4 id=shape-inside-property><span class=secno>3.4.2. </span>The ‘<a
   href="#shape-inside"><code class=property>shape-inside</code></a>’
   Property</h4>

  <p> The ‘<a href="#shape-inside"><code
   class=property>shape-inside</code></a>’ property adds one or more
   exclusion areas to the element's wrapping context. This modifies the
   normal rectangular shape of the content area to a possibly non-rectangular
   wrapping area. The exclusion areas are defined by subtracting the shape
   from the element's content area. Any part of the shape outside the
   element's content area has no effect.

  <table class=propdef>
   <tbody>
    <tr>
     <th>Name:

     <td><dfn id=shape-inside title=shape-inside>shape-inside</dfn>

    <tr>
     <th>Value:

     <td><var>outside-shape</var> | <a href="#auto"><var>auto</var></a> | <a
      href="#ltbasic-shapegt"><var>&lt;basic-shape&gt;</var></a> | <a
      href="#lturigt"><var>&lt;uri&gt;</var></a>

    <tr>
     <th>Initial:

     <td>auto

    <tr>
     <th>Applies to:

     <td>block-level elements

    <tr>
     <th>Inherited:

     <td>no

    <tr>
     <th>Percentages:

     <td>N/A

    <tr>
     <th>Media:

     <td>visual

    <tr>
     <th>Computed value:

     <td>computed lengths for &lt;basic-shape&gt;, the absolute URI for
      &lt;uri&gt;, otherwise as specified
  </table>

  <p>The values of this property have the following meanings:

  <dl>
   <dt><dfn id=auto>auto</dfn>

   <dd> The shape is computed based on the content box of the element.
  </dl>

  <dl>
   <dt><dfn id=ltbasic-shapegt>&lt;basic-shape&gt;</dfn>

   <dd> The shape is computed based on the values of one of ‘<code
    class=property>rectangle</code>’, ‘<code
    class=property>inset-rectangle</code>’, ‘<code
    class=property>circle</code>’, ‘<code
    class=property>ellipse</code>’ or ‘<code
    class=property>polygon</code>’.
  </dl>

  <dl>
   <dt><dfn id=lturigt>&lt;uri&gt;</dfn>

   <dd> If the &lt;uri&gt; references an SVG shape element, that element
    defines the shape. Otherwise, if the &lt;uri&gt; references an image, the
    shape is extracted and computed based on the alpha channel of the
    specified image. If the &lt;uri&gt; does not reference an SVG shape
    element or an image, the effect is as if the value ‘<a
    href="#auto"><code class=property>auto</code></a>’ had been specified.
  </dl>

  <p>The ‘<a href="#shape-inside"><code
   class=property>shape-inside</code></a>’ property applies to floats.

  <p>The ‘<a href="#shape-inside"><code
   class=property>shape-inside</code></a>’ property may not apply on some
   elements such as elements with a computed ‘<code
   class=property>display</code>’ value of ‘<code
   class=property>table</code>’.

  <div class=figure> <img
   alt="Content flowing with and without a shape-inside"
   src="images/shape-inside-content.png">
   <p class=caption>Effect of shape-inside on inline content.
  </div>

  <p>Overflow content avoids the exclusion area(s) added by ‘<a
   href="#shape-inside"><code class=property>shape-inside</code></a>’ and
   ‘<a href="#shape-padding"><code
   class=property>shape-padding</code></a>’ (as well as any other exclusion
   areas in the element's wrapping context).

  <div class=figure> <img alt="Overflow interacting with rounded rect"
   src="images/rounded-rect-overflow.png"
   style="display:inline-block;vertical-align:top"> <img
   alt="Overflow interacting with ellipse" src="images/ellipse-overflow.png"
   style="display:inline-block;vertical-align:top">
   <p class=caption>Overflow interacting with exclusion areas defined by
    ‘<a href="#shape-inside"><code
    class=property>shape-inside</code></a>’ and ‘<a
    href="#shape-padding"><code class=property>shape-padding</code></a>’.
  </div>

  <p> When a shape-inside has a definite size (no percentages used in the
   shape's definition) an auto-sized element should use the shape as a
   constraint in determining its maximum size.</p>
  <!-- End section "The shape-inside property" -->

  <h4 id=shape-image-threshold-property><span class=secno>3.4.3. </span>The
   ‘<code class=property>shape-image-threshold</code>’ Property</h4>

  <p>Add the final <a
   href="http://www.w3.org/TR/css-shapes/#shape-image-threshold-property">level
   1</a> section with the change that it applies to both <a
   href="#shape-inside">shape-inside</a> and <span>shape-outside</span>.</p>
  <!-- End section "The shape-image-threshold property" -->

  <h4 id=shape-image-source-type-property><span class=secno>3.4.4. </span>The
   ‘<code class=property>shape-image-source-type</code>’ Property</h4>

  <p> Should we add an alpha/luminance switch to determine which values we
   use from the shape-image source? This could just be a keyword on the
   shape-image-threshold property. Whatever we go with should be compatible
   with the alpha/luminance switch from mask sources.</p>
  <!-- End section "The shape-image-source-type-property" -->

  <h4 id=shape-margin-property><span class=secno>3.4.5. </span>The ‘<code
   class=property>shape-margin</code>’ property</h4>

  <p>Add the final <a
   href="http://www.w3.org/TR/css-shapes/#shape-margin-property">level 1</a>
   section with the change that it applies to exclusions.</p>
  <!-- End secion "shape-margin property" -->

  <h4 id=shape-padding-property><span class=secno>3.4.6. </span>The ‘<a
   href="#shape-padding"><code class=property>shape-padding</code></a>’
   Property</h4>

  <p> The ‘<a href="#shape-padding"><code
   class=property>shape-padding</code></a>’ property adds padding to a
   shape-inside. This defines a new shape where every point is the specified
   distance from the shape-inside. This property takes on positive values
   only.

  <table class=propdef>
   <tbody>
    <tr>
     <th>Name:

     <td><dfn id=shape-padding title=shape-padding>shape-padding</dfn>

    <tr>
     <th>Value:

     <td><var>&lt;length&gt;</var>

    <tr>
     <th>Initial:

     <td>0

    <tr>
     <th>Applies to:

     <td>block-level elements

    <tr>
     <th>Inherited:

     <td>no

    <tr>
     <th>Percentages:

     <td>N/A

    <tr>
     <th>Media:

     <td>visual

    <tr>
     <th>Computed value:

     <td>the absolute length
  </table>

  <div class=example>
   <p>A ‘<a href="#shape-padding"><code
    class=property>shape-padding</code></a>’ creating an offset from a
    circlular shape-inside. The light blue rectangles represent inline
    content affected by the shape created by the padding.</p>
   <img alt="Example of a shape-padding offset"
   src="images/shape-padding.png"></div>
  <!-- End section "shape-padding property" -->

  <p class=note>Note that the ‘<a href="#shape-padding"><code
   class=property>shape-padding</code></a>’ property only affects layout of
   content inside the element it applies to while the ‘<code
   class=property>shape-margin</code>’ property only affects layout of
   content outside the element.</p>
  <!-- End section "Declaring Shapes" -->
  <!-- End section "Shapes" -->

  <h2 id=conformance><span class=secno>4. </span>Conformance</h2>
  <!--begin-conformance-->

  <h3 class=no-ref id=conventions> Document conventions</h3>

  <p>Conformance requirements are expressed with a combination of descriptive
   assertions and RFC 2119 terminology. The key words “MUST”, “MUST
   NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”,
   “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in the
   normative parts of this document are to be interpreted as described in RFC
   2119. However, for readability, these words do not appear in all uppercase
   letters in this specification.

  <p>All of the text of this specification is normative except sections
   explicitly marked as non-normative, examples, and notes. <a
   href="#ref-RFC2119" rel=biblioentry>[RFC2119]<!--{{!RFC2119}}--></a>

  <p>Examples in this specification are introduced with the words “for
   example” or are set apart from the normative text with
   <code>class="example"</code>, like this:

  <div class=example>
   <p>This is an example of an informative example.
  </div>

  <p>Informative notes begin with the word “Note” and are set apart from
   the normative text with <code>class="note"</code>, like this:

  <p class=note>Note, this is an informative note.

  <h3 class=no-ref id=conformance-classes> Conformance classes</h3>

  <p>Conformance to this specification is defined for three conformance
   classes:

  <dl>
   <dt><dfn id=style-sheet title="style sheet!!as conformance class">style
    sheet</dfn>

   <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#style-sheet">CSS
    style sheet</a>.

   <dt><dfn id=renderer>renderer</dfn>

   <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a>
    that interprets the semantics of a style sheet and renders documents that
    use them.

   <dt><dfn id=authoring-tool>authoring tool</dfn>

   <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a>
    that writes a style sheet.
  </dl>

  <p>A style sheet is conformant to this specification if all of its
   statements that use syntax defined in this module are valid according to
   the generic CSS grammar and the individual grammars of each feature
   defined in this module.

  <p>A renderer is conformant to this specification if, in addition to
   interpreting the style sheet as defined by the appropriate specifications,
   it supports all the features defined by this specification by parsing them
   correctly and rendering the document accordingly. However, the inability
   of a UA to correctly render a document due to limitations of the device
   does not make the UA non-conformant. (For example, a UA is not required to
   render color on a monochrome monitor.)

  <p>An authoring tool is conformant to this specification if it writes style
   sheets that are syntactically correct according to the generic CSS grammar
   and the individual grammars of each feature in this module, and meet all
   other conformance requirements of style sheets as described in this
   module.

  <h3 class=no-ref id=partial> Partial implementations</h3>

  <p>So that authors can exploit the forward-compatible parsing rules to
   assign fallback values, CSS renderers <strong>must</strong> treat as
   invalid (and <a
   href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignore as
   appropriate</a>) any at-rules, properties, property values, keywords, and
   other syntactic constructs for which they have no usable level of support.
   In particular, user agents <strong>must not</strong> selectively ignore
   unsupported component values and honor supported values in a single
   multi-value property declaration: if any value is considered invalid (as
   unsupported values must be), CSS requires that the entire declaration be
   ignored.

  <h3 class=no-ref id=experimental> Experimental implementations</h3>

  <p>To avoid clashes with future CSS features, the CSS 2.1 specification
   reserves a <a
   href="http://www.w3.org/TR/CSS21/syndata.html#vendor-keywords">prefixed
   syntax</a> for proprietary and experimental extensions to CSS.

  <p>Prior to a specification reaching the Candidate Recommendation stage in
   the W3C process, all implementations of a CSS feature are considered
   experimental. The CSS Working Group recommends that implementations use a
   vendor-prefixed syntax for such features, including those in W3C Working
   Drafts. This avoids incompatibilities with future changes in the draft.

  <h3 class=no-ref id=testing> Non-experimental implementations</h3>

  <p>Once a specification reaches the Candidate Recommendation stage,
   non-experimental implementations are possible, and implementors should
   release an unprefixed implementation of any CR-level feature they can
   demonstrate to be correctly implemented according to spec.

  <p>To establish and maintain the interoperability of CSS across
   implementations, the CSS Working Group requests that non-experimental CSS
   renderers submit an implementation report (and, if necessary, the
   testcases used for that implementation report) to the W3C before releasing
   an unprefixed implementation of any CSS features. Testcases submitted to
   W3C are subject to review and correction by the CSS Working Group.

  <p>Further information on submitting testcases and implementation reports
   can be found from on the CSS Working Group's website at <a
   href="http://www.w3.org/Style/CSS/Test/">http://www.w3.org/Style/CSS/Test/</a>.
   Questions should be directed to the <a
   href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a>
   mailing list. <!--end-conformance-->

  <h2 class=no-num id=acknowledgments>Acknowledgments</h2>
  <!--<p>This specification is made possible by input from

        and the CSS Working Group members.
    </p>-->

  <h2 class=no-num id=references>References</h2>

  <h3 class=no-num id=normative-references>Normative references</h3>
  <!--begin-normative-->
  <!-- Sorted by label -->

  <dl class=bibliography>
   <dd style="display: none"><!-- keeps the doc valid if the DL is empty -->
    <!---->

   <dt id=ref-RFC2119>[RFC2119]

   <dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key
    words for use in RFCs to Indicate Requirement Levels.</cite></a> RFC
    2119. URL: <a
    href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
   </dd>
   <!---->
  </dl>
  <!--end-normative-->

  <h3 class=no-num id=other-references>Other references</h3>
  <!--begin-informative-->
  <!-- Sorted by label -->

  <dl class=bibliography>
   <dd style="display: none"><!-- keeps the doc valid if the DL is empty -->
    <!---->

   <dt id=ref-CSS-SHAPES>[CSS-SHAPES]

   <dd>Vincent Hardy; Rossen Atanassov; Alan Stearns. <a
    href="http://www.w3.org/TR/2014/WD-css-shapes-1-20140211/"><cite>CSS
    Shapes Module Level 1.</cite></a> 11 February 2014. W3C Last Call Working
    Draft. (Work in progress.) URL: <a
    href="http://www.w3.org/TR/2014/WD-css-shapes-1-20140211/">http://www.w3.org/TR/2014/WD-css-shapes-1-20140211/</a>
   </dd>
   <!---->
  </dl>
  <!--end-informative-->

  <h2 class=no-num id=index>Index</h2>
  <!--begin-index-->

  <ul class=indexlist>
   <li>authoring tool, <a href="#authoring-tool"
    title="section 4."><strong>4.</strong></a>

   <li>auto, <a href="#auto"
    title="section 3.4.2."><strong>3.4.2.</strong></a>

   <li>&lt;basic-shape&gt;, <a href="#ltbasic-shapegt"
    title="section 3.4.2."><strong>3.4.2.</strong></a>

   <li>Content area, <a href="#content-area"
    title="section 2."><strong>2.</strong></a>

   <li>Exclusion area, <a href="#exclusion-area"
    title="section 2."><strong>2.</strong></a>

   <li>Float area, <a href="#float-area"
    title="section 2."><strong>2.</strong></a>

   <li>rectangle(), <a href="#rectangle"
    title="section 3.1."><strong>3.1.</strong></a>

   <li>renderer, <a href="#renderer"
    title="section 4."><strong>4.</strong></a>

   <li>shape-inside, <a href="#shape-inside"
    title="section 3.4.2."><strong>3.4.2.</strong></a>

   <li>shape-padding, <a href="#shape-padding"
    title="section 3.4.6."><strong>3.4.6.</strong></a>

   <li>style sheet
    <ul>
     <li>as conformance class, <a href="#style-sheet"
      title="section 4."><strong>4.</strong></a>
    </ul>

   <li>&lt;uri&gt;, <a href="#lturigt"
    title="section 3.4.2."><strong>3.4.2.</strong></a>
  </ul>
  <!--end-index-->

  <h2 class=no-num id=property-index>Property index</h2>
  <!--begin-properties-->

  <table class=proptable>
   <thead>
    <tr>
     <th>Property

     <th>Values

     <th>Initial

     <th>Applies to

     <th>Inh.

     <th>Percentages

     <th>Media

   <tbody>
    <tr>
34B2
     <th><a class=property href="#shape-inside">shape-inside</a>

     <td>outside-shape | auto | &lt;basic-shape&gt; | &lt;uri&gt;

     <td>auto

     <td>block-level elements

     <td>no

     <td>N/A

     <td>visual

    <tr>
     <th><a class=property href="#shape-padding">shape-padding</a>

     <td>&lt;length&gt;

     <td>0

     <td>block-level elements

     <td>no

     <td>N/A

     <td>visual
  </table>
  <!--end-properties-->
  <!-- template markup for issues pulled from Bugzilla -->
  <!-- issue template and script need a new API to access bugzilla
      <script type="text/template" id="issue-template">
  <div class="issue-marker" data-bug_id="{{bug_id}}" data-bug_status="{{bug_status}}">
      <a href="https://www.w3.org/Bugs/Public/show_bug.cgi?id={{bug_id}}">Issue-{{bug_id}}</a>
      <div class="issue-details">
          <p class="short-desc">{{short_desc}}</p>
      </div>
  </div>
      </script>

      <script type="text/javascript" src="../shared/scripts/BugzillaTrackerUtil.js"></script>
      <script type="text/javascript" src="../shared/scripts/BugzillaTracker.js"></script>
      <script type="text/javascript">
          checkSpecificationIssues('CSS', 'Shapes');
      </script>
      -->

  <h2 class=no-num id=change-log>Change Log</h2>
</html>
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