csswg-drafts/css3-exclusions/Overview.html at ac746778d28085a46b4f3e0ec2fd081b287c92df · simonwuelker/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://www.w3.org/2006/03/hcard"><meta
  content="text/html; charset=utf-8" http-equiv=Content-Type>

  <title>CSS Exclusions and Shapes Module Level 3</title>
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  @import url(fonts/Droid-Sans-Mono-fontfacekit/stylesheet.css);

    .singleImgExample {
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        float:left;
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        margin-right:0.8em;
        text-transform:uppercase;
    }

  </style>
  <link href="http://www.w3.org/StyleSheets/TR/W3C-ED.css" rel=stylesheet
  type="text/css">
  <link href="../alternate-spec-style.css" id=st rel=stylesheet
  title="alternate spec styles" type="text/css">

 <body>
  <div class=head id=div-head>
   <p><a href="http://www.w3.org/"><img alt=W3C height=53 id=mobile-logo
    src="http://www.w3.org/2008/site/images/logo-w3c-mobile-lg" width=90></a>
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   <h1 id=css-exclusions-module>CSS Exclusions and Shapes Module Level 3</h1>

   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 27 March 2012</h2>

   <dl>
    <dt>This version:

    <dd><a
     href="http://dev.w3.org/csswg/css3-exclusions/">http://dev.w3.org/csswg/css3-exclusions/</a></dd>
    <!--<dd><a href="http://www.w3.org/TR/2012/ED-css3-exclusions-20120327/">http://www.w3.org/TR/2012/WD-css3-exclusions-20120327/</a></dd>-->

    <dt>Latest version:

    <dd><a
     href="http://www.w3.org/TR/css3-exclusions/">http://www.w3.org/TR/css3-exclusions/</a>

    <dt>Editor's Draft:

    <dd><a
     href="http://dev.w3.org/csswg/css3-exclusions/">http://dev.w3.org/csswg/css3-exclusions/</a>


    <dt>Previous version:

    <dd>None

    <dt>Editors:

    <dd class=vcard><span class=fn>Vincent Hardy</span>, <span
     class=org>Adobe Systems, Inc.</span>, <span
     class=email>vhardy@adobe.com</span>

    <dd class=vcard><span class=fn>Rossen Atanassov</span>, <span
     class=org>Microsoft Corporation</span>, <span
     class=email>ratan@microsoft.com</span>

    <dt>Issues List:

    <dd><a
     href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&product=CSS&component=Exclusions&resolution=---&cmdtype=doit">in
     Bugzilla</a>

    <dt>Discussion:

    <dd><a
     href="http://lists.w3.org/Archives/Public/www-style/">www-style@w3.org</a>
     with subject line "<code>[css3-exclusions] message topic</code>"
   </dl>
   <!--begin-copyright-->
   <p class=copyright><a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
    rel=license>Copyright</a> &copy; 2012 <a href="http://www.w3.org/"><abbr
    title="World Wide Web Consortium">W3C</abbr></a><sup>&reg;</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>), All Rights Reserved. W3C <a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
    <a
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    and <a
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    use</a> rules apply.</p>
   <!--end-copyright-->
   <hr title="Separator for header">
  </div>

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

  <p> CSS Exclusions define arbitrary areas around which inline content can
   flow. CSS Exclusions can be defined on any CSS block-level elements. CSS
   Exclusions extend the notion of content wrapping previously limited to
   floats.

  <p>CSS Shapes control the geometric shapes used for wrapping inline flow
   content outside or inside an element. CSS Shapes can be applied to any
   element. A circle shape on a float will cause inline content to wrap
   around the circle shape instead of the float's bounding box.

  <p>Combining CSS Exclusions and CSS Shapes allows sophisticated layouts,
   allowing interactions between shapes in complex positioning schemes.

  <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 W3
13CC
C. 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=%5Bcss3-exclusions%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
   &#8220;css3-exclusions&#8221; in the subject, preferably like this:
   &#8220;[<!---->css3-exclusions<!---->] <em>&hellip;summary of
   comment&hellip;</em>&#8221;

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

  <p>This document was produced by a group operating under the <a
   href="/Consortium/Patent-Policy-20040205/"&g
6CC2
t;5 February 2004 W3C Patent
   Policy</a>. W3C maintains a <a href="/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="/Consortium/Patent-Policy-20040205/#def-essential">Essential
   Claim(s)</a> must disclose the information in accordance with <a
   href="/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the
   W3C Patent Policy</a>.</p>
  <!--end-status-->

  <p>This is the First Public Working Draft of the CSS Exclusions and Shapes
   Level 3 Module.

  <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="#definitions"><span class=secno>2. </span>Definitions</a>

   <li><a href="#exclusions"><span class=secno>3. </span>Exclusions</a>
    <ul class=toc>
     <li><a href="#declaring-exclusions"><span class=secno>3.1.
      </span>Declaring exclusions</a>
      <ul class=toc>
       <li><a href="#wrap-flow-property"><span class=secno>3.1.1. </span>The
        &lsquo;<code class=property>wrap-flow</code>&rsquo; property</a>
      </ul>

     <li><a href="#scope-and-effect-of-exclusions"><span class=secno>3.2.
      </span>Scope and Effect of Exclusions</a>
      <ul class=toc>
       <li><a href="#wrap-margin-property"><span class=secno>3.2.1.
        </span>The &lsquo;<code class=property>wrap-margin</code>&rsquo;
        Property</a>

       <li><a href="#wrap-padding-property"><span class=secno>3.2.2.
        </span>The &lsquo;<code class=property>wrap-padding</code>&rsquo;
        Property</a>
      </ul>

     <li><a href="#propagation-of-exclusions"><span class=secno>3.3.
      </span>Propagation of Exclusions</a>
      <ul class=toc>
       <li><a href="#wrap-through-property"><span class=secno>3.3.1.
        </span>The &lsquo;<code class=property>wrap-through</code>&rsquo;
        Property</a>

       <li><a href="#wrap-shorthand-property"><span class=secno>3.3.2.
        </span>The &lsquo;<code class=property>wrap</code>&rsquo; Shorthand
        Property</a>
      </ul>

     <li><a href="#exclusions-order"><span class=secno>3.4. </span>Exclusions
      order</a>

     <li><a href="#exclusions-processing-model"><span class=secno>3.5.
      </span>Processing model</a>
      <ul class=toc>
       <li><a href="#exclusions-processing-model-example"><span
        class=secno>3.5.1. </span>Example</a>
        <ul class=toc>
         <li><a href="#step-1-resolve-exclusion-boxes-belonging"><span
          class=secno>3.5.1.1. </span>Step 1: resolve exclusion boxes
          belonging to each wrapping context</a>

         <li><a href="#step-2-resolve-wrapping-contexts-and-lay"><span
          class=secno>3.5.1.2. </span>Step 2: resolve wrapping contexts and
          layout containing blocks</a>
          <ul class=toc>
           <li><a href="#resolving-rwc-1"><span class=secno>3.5.1.2.1.
            </span>Resolving RWC-1</a>

           <li><a href="#resolving-rwc-2"><span class=secno>3.5.1.2.2.
            </span>Resolving RWC-2</a>
          </ul>
        </ul>
      </ul>
    </ul>

   <li><a href="#shapes"><span class=secno>4. </span>Shapes</a>
    <ul class=toc>
     <li><a href="#shapes-from-svg-syntax"><span class=secno>4.1.
      </span>Shapes from SVG Syntax</a>
      <ul class=toc>
       <li><a href="#supported-svg-shapes"><span class=secno>4.1.1.
        </span>Supported SVG Shapes</a>

       <li><a href="#referencing-svg-shapes"><span class=secno>4.1.2.
        </span>Referencing SVG shapes</a>
      </ul>

     <li><a href="#shapes-from-image"><span class=secno>4.2. </span>Shapes
      from Image</a>

     <li><a href="#declaring-shapes"><span class=secno>4.3. </span>Declaring
      Shapes</a>
      <ul class=toc>
        </span>The &lsquo;<code class=property>shape-outside</code>&rsquo;
        Property</a>

       <li><a href="#shape-inside-property"><span class=secno>4.3.2.
        </span>The &lsquo;<code class=property>shape-inside</code>&rsquo;
        Property</a>

       <li><a href="#shape-image-threshold-property"><span class=secno>4.3.3.
        </span>The &lsquo;<code
        class=property>shape-image-threshold</code>&rsquo; Property</a>
      </ul>
    </ul>

   <li><a href="#conformance"><span class=secno>5. </span>Conformance</a>
    <ul class=toc>
     <li><a href="#conventions"><span class=secno>5.1. </span>Document
      Conventions</a>

     <li><a href="#conformance-classes"><span class=secno>5.2.
      </span>Conformance Classes</a>

     <li><a href="#partial"><span class=secno>5.3. </span> Partial
      Implementations</a>

     <li><a href="#experimental"><span class=secno>5.4. </span> Experimental
      Implementations</a>

     <li><a href="#testing"><span class=secno>5.5. </span> Non-Experimental
      Implementations</a>

     <li><a href="#cr-exit-criteria"><span class=secno>5.6. </span> CR Exit
      Criteria</a>
    </ul>

   <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>
  </ul>
  <!--end-toc-->

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

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

  <p> The exclusions section of this specification defines features that
   allow inline flow content to wrap around outside the <a
   href="#exclusion-area">exclusion area</a> of elements.

  <p> The shapes section of the specification defines properties to control
   the geometry of an element's <a href="#exclusion-area">exclusion area</a>
   as well as the geometry used for wrapping an element's inline flow
   content.

  <h2 id=definitions><span class=secno>2. </span>Definitions</h2>

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

  <p> A <a href="http://www.w3.org/TR/css3-box/">box</a> (<a href="#CSS3BOX"
   rel=biblioentry>[CSS3BOX]<!--{{!CSS3BOX}}--></a>) that defines an <a
   href="#exclusion-area">exclusion area</a> for other boxes. The &lsquo;<a
   href="#wrap-flow"><code class=property>wrap-flow</code></a>&rsquo;
   property is used to make an element's generated box an exclusion box. An
   exclusion box contributes its <a href="#exclusion-area">exclusion area</a>
   to its <a
   href="http://www.w3.org/TR/CSS2/visudet.html#containing-block-details">
   containing block's</a> <a href="#wrapping-context">wrapping context</a>

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

  <div class=issue-marker data-bug_id=15087 data-bug_status=NEW> <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15087">Bug-15087</a>
   <div class=issue-details>
    <p class=short-desc>Interaction of floats and exclusions (Howcome's
     questions)</p>
   </div>
  </div>

  <p> The area used for excluding inline flow content around an exclusion
   element. The exclusion area is equivalent to the <a
   href="http://www.w3.org/TR/CSS2/box.html#box-dimensions"> border box</a>
   for elements whose computed &lsquo;<code
   class=property>float</code>&rsquo; property is &lsquo;<code
   class=property>none</code>&rsquo; and the <a
   href="http://www.w3.org/TR/CSS2/box.html#box-dimensions">margin box</a>
   otherwise. This specification's &lsquo;<a href="#shape-outside"><code
   class=property>shape-outside</code></a>&rsquo; property can be used to
   define arbitrary, non-rectangular exclusion areas.

  <p><dfn id=wrapping-context>Wrapping context</dfn>

  <div class=issue-marker data-bug_id=15086 data-bug_status=NEW> <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15086">Bug-15086</a>
   <div class=issue-details>
    <p class=short-desc>should the wrapping context be generic and include
     floats?</p>
   </div>
  </div>

  <p> The wrapping context of a box is a collection of &lsquo;<a
   href="#exclusion-area"><code class=css>exclusion areas</code></a>&rsquo;.
   The wrapping context is used to wrap around inline flow content during
   layout. A box will wrap its inline flow content in the area that
   corresponds to the subtraction of its wrapping context from its own <a
   href="#content-area">content area</a>.

  <p> A box inherits its <a
   href="http://www.w3.org/TR/CSS2/visudet.html#containing-block-details">containing
   block's</a> wrapping context unless it specifically resets it using the
   &lsquo;<a href="#wrap-through"><code
   class=property>wrap-through</code></a>&rsquo; property.

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

  <p> The area used for layout of the inline flow content of a box. By
   default the area is equivalent to the <a
   href="http://www.w3.org/TR/CSS2/box.html#box-dimensions">content box</a>.
   This specification's &lsquo;<a href="#shape-inside"><code
   class=property>shape-inside</code></a>&rsquo; property can define
   arbitrary, non-rectangular content areas.

  <p><dfn id=outside-and-inside title=outside-inside>Outside and inside</dfn>


  <p> In this specification, &lsquo;<code
   class=property>outside</code>&rsquo; refers to DOM content that is not a
   descendant of an element while &lsquo;<code
   class=property>inside</code>&rsquo; refers to the element's descendants.

  <h2 id=exclusions><span class=secno>3. </span>Exclusions</h2>

  <p> Exclusion elements define exclusion areas that contribute to their
   containing block's wrapping context. As a consequence, exclusions impact
   the layout of their containing block's descendants.

  <p>

  <p> Elements layout their inline content in their <a
   href="#content-area">content area</a> and avoid the areas in their
   associated wrapping context. If the element is itself an exclusion, it
   does not wrap around its own exclusion shape and the impact of other
   exclusions on other exclusions is controlled by the &lsquo;<code
   class=property>z-index</code>&rsquo; property as explained in the <a
   href="#exclusions-order">exclusions order</a> section.

  <p> The shape properties can be used to change the shape of exclusions.

  <h3 id=declaring-exclusions><span class=secno>3.1. </span>Declaring
   exclusions</h3>

  <p> An element becomes an exclusion when its &lsquo;<a
   href="#wrap-flow"><code class=property>wrap-flow</code></a>&rsquo;
   property has a computed value other than &lsquo;<code
   class=property>auto</code>&rsquo;.

  <h4 id=wrap-flow-property><span class=secno>3.1.1. </span>The &lsquo;<a
   href="#wrap-flow"><code class=property>wrap-flow</code></a>&rsquo;
   property</h4>

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

     <td><dfn id=wrap-flow title="'wrap-flow'">wrap-flow</dfn>

    <tr>
     <th>Value:

     <td><var>auto</var> | <var>both</var> | <var>start</var> |
      <var>end</var> | <var>maximum</var> | <var>clear</var>

    <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&nbsp;value:

     <td>as specified, except for floats all values compute to &lsquo;<code
      class=property>auto</code>&rsquo;
  </table>

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

  <dl>
   <dt><dfn id=auto title="'wrap-flow'!!'auto'">auto</dfn>

   <dd> No exclusion is created. Inline flow content interacts with the
    element as usual.

   <dt><dfn id=both title="'wrap-flow'!!'both'">both</dfn>

   <dd> Inline flow content can flow on all sides of the exclusion.

   <dt><dfn id=start title="'wrap-flow'!!'start'">start</dfn>

   <dd> Inline flow content can flow before the start edge of the exclusion
    area but must leave the area after the end edge of the exclusion empty.

   <dt><dfn id=end title="'wrap-flow'!!'end'">end</dfn>

   <dd> Inline flow content can flow after the end edge of the exclusion area
    but must leave the area before the start edge of the exclusion empty.

   <dt><dfn id=maximum title="'wrap-flow'!!'maximum'">maximum</dfn>

   <dd> Inline flow content can flow on the edge of the exclusion with the
    largest available space for the given line, and must leave the other edge
    of the exclusion empty.

   <dt><dfn id=clear title="'wrap-flow'!!'clear'">clear</dfn>

   <dd> Inline flow content can only flow on top and bottom edges of the
    exclusion and must leave the areas before the start and after the end
    edges of the exclusion empty.
  </dl>

  <p> Setting the &lsquo;<a href="#wrap-flow"><code
   class=property>wrap-flow</code></a>&rsquo; property to &lsquo;<code
   class=property>both</code>&rsquo;, &lsquo;<code
   class=property>start</code>&rsquo;, &lsquo;<code
   class=property>end</code>&rsquo;, &lsquo;<code
   class=property>maximum</code>&rsquo; or &lsquo;<code
   class=pro
8096
perty>clear</code>&rsquo; on an element makes that element an
   <span>exclusion element. It's <span>exclusion shape</span> is contributed
   to its containing block's wrapping context, causing the containing block's
   descendants to wrap around its exclusion area. </span>

  <p> The initial value for this property is &lsquo;<code
   class=property>auto</code>&rsquo;.

  <p> When the property's computed value is &lsquo;<code
   class=property>auto</code>&rsquo;, the element does not become an
   <span>exclusion</span> unless its &lsquo;<code
   class=property>float</code>&rsquo; property's computed value is not
   &lsquo;<code class=property>none</code>&rsquo;. In that case, the element
   contributes its &lsquo;<code class=css>border box</code>&rsquo; to its
   containing block's <a href="#wrapping-context">wrapping context</a> and
   content flows around it according to the &lsquo;<code
   class=property>clear</code>&rsquo; property.

  <p> The element will be considered as an exclusion for all inline flow
   content descendants of the exclusions' containing block.

  <div class=figure> <img
   alt="General illustration showing how exclusions combine"
   src="images/exclusions-illustration.png" width="70%">
   <p class=caption>Combining exclusions</p>
  </div>

  <p> The above figure illustrates how exclusions are combined. The outermost
   box represents an element's content box. The A, B, C and D darker gray
   boxes represent exclusions in the element's wrapping context. A, B, C and
   D have their respective &lsquo;<a href="#wrap-flow"><code
   class=property>wrap-flow</code></a>&rsquo; set to &lsquo;<code
   class=property>both</code>&rsquo;, &lsquo;<code
   class=property>start</code>&rsquo;, &lsquo;<code
   class=property>end</code>&rsquo; and &lsquo;<code
   class=property>clear</code>&rsquo; respectively. The lighter gray areas
   show the additional areas that are excluded for inline layout as a result
   of the &lsquo;<a href="#wrap-flow"><code
   class=property>wrap-flow</code></a>&rsquo; value. For example, the area to
   the right of &lsquo;<code class=property>B</code>&rsquo; cannot be used
   for inline layout because the &lsquo;<a href="#wrap-flow"><code
   class=property>wrap-flow</code></a>&rsquo; for &lsquo;<code
   class=property>B</code>&rsquo; is &lsquo;<code
   class=property>start</code>&rsquo;.

  <p> The background &lsquo;<code class=property>blue</code>&rsquo; area
   shows what areas are available for inline content layout. All areas
   represented with a light or dark shade of gray are not available for
   inline content layout.

  <div class=issue-marker data-bug_id=15088 data-bug_status=FIXED> <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15088">Bug-15088</a>
   <div class=issue-details>
    <p class=short-desc>Add an example with auto-height content and z-index
     for exclusions order.</p>
   </div>
  </div>

  <div class=issue-marker data-bug_id=15084 data-bug_status=NEW> <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15084">Bug-15084</a>
   <div class=issue-details>
    <p class=short-desc>Fluidity of the layout with respect to different
     amounts of content</p>
   </div>
  </div>

  <div class=example>
   <p> The &lsquo;<a href="#wrap-flow"><code
    class=property>wrap-flow</code></a>&rsquo; property values applied to an
    absolutely positioned element.</p>
   <code class=html></code>
   <pre>
&lt;style type="text/css"&gt;
    #exclusion {
    	position: absolute;
    	background: lightblue;
    	border: 3px solid blue;
    }
&lt;/style&gt;

&lt;div style=”position: relative; border: 1px solid black;”&gt;
    &lt;div id=”exclusion”&gt;Donec metus messa, mollis...&lt;/div&gt;
    Lorem ipsum dolor sit amet...
&lt;/div&gt;
</pre>

   <table class=example-table>
    <tbody>
     <tr>
      <td><code class=html>#exclusion{ wrap-flow: auto; }</code>

      <td><code class=html>#exclusion{ wrap-flow: both; }</code>

     <tr>
      <td><img alt="Example rendering for wrap-side: auto"
       src="images/exclusion_wrap_side_auto.png">

      <td><img alt="Example rendering for wrap-side: both"
       src="images/exclusion_wrap_side_both.png">

     <tr>
      <td><code class=html>#exclusion{ wrap-flow: start; }</code>

      <td><code class=html>#exclusion{ wrap-flow: end; }</code>

     <tr>
      <td><img alt="Example rendering for wrap-side: start"
       src="images/exclusion_wrap_side_left.png">

      <td><img alt="Example rendering for wrap-side: end"
       src="images/exclusion_wrap_side_right.png">

     <tr>
      <td><code class=html>#exclusion{ wrap-flow: maximum; }</code>

      <td><code class=html>#exclusion{ wrap-flow: maximum; }</code>

     <tr>
      <td><img alt="Example rendering for wrap-side: maximum"
       src="images/exclusion_wrap_side_maximum_L.png">

      <td><img alt="Example rendering for wrap-side: maximum"
       src="images/exclusion_wrap_side_maximum_R.png">

     <tr>
      <td><code class=html>#exclusion{ wrap-flow: clear; }</code>

      <td><code class=html>&nbsp;</code>

     <tr>
      <td><img alt="Example rendering for wrap-side: clear"
       src="images/exclusion_wrap_side_clear.png">

      <td>&nbsp;
   </table>
  </div>
  <!-- End section "wrap-flow Property" -->
  <!-- End section "Declaring Exclusions" -->

  <h3 id=scope-and-effect-of-exclusions><span class=secno>3.2. </span>Scope
   and Effect of Exclusions</h3>

  <p> An exclusion affects the inline flow content descended from the
   exclusion's containing blocks (defined in <a
   href="http://www.w3.org/TR/CSS2/visudet.html#containing-block-details">
   CSS 2.1 10.1</a>) and that of all descendant elements of the same
   containing block. All inline flow content inside the containing block of
   the exclusions is affected. To stop the effect of exclusions defined
   outside any element, the &lsquo;<a href="#wrap-through"><code
   class=property>wrap-through</code></a>&rsquo; property can be used (see
   definition of Propagation of Exclusions below).

  <h4 id=wrap-margin-property><span class=secno>3.2.1. </span>The &lsquo;<a
   href="#wrap-margin"><code class=property>wrap-margin</code></a>&rsquo;
   Property</h4>

  <p> The &lsquo;<a href="#wrap-margin"><code
   class=property>wrap-margin</code></a>&rsquo; property can be used to
   offset the inline flow content wrapping on the outside of exclusions.
   Offsets created by the &lsquo;<a href="#wrap-margin"><code
   class=property>wrap-margin</code></a>&rsquo; property are offset from the
   outside of the exclusion. This property takes on positive values only.

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

     <td><dfn id=wrap-margin title="'wrap-margin'">wrap-margin</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&nbsp;value:

     <td>the absolute length
  </table>
  <!-- End secion "wrap-margin property" -->

  <h4 id=wrap-padding-property><span class=secno>3.2.2. </span>The &lsquo;<a
   href="#wrap-padding"><code class=property>wrap-padding</code></a>&rsquo;
   Property</h4>

  <p> The &lsquo;<a href="#wrap-padding"><code
   class=property>wrap-padding</code></a>&rsquo; property can be used to
   offset to the inline flow content wrapping on the inside of elements.
   Offsets created by the &lsquo;<a href="#wrap-padding"><code
   class=property>wrap-padding</code></a>&rsquo; property are offset from the
   <a href="#content-area">content area</a> of the element. This property
   takes on positive values only.

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

     <td><dfn id=wrap-padding title="'wrap-padding'">wrap-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&nbsp;value:

     <td>the absolute length
  </table>
  <!-- End section "wrap-padding property" -->

  <div class=note>Note that the &lsquo;<a href="#wrap-padding"><code
   class=property>wrap-padding</code></a>&rsquo; property affects layout of
   content inside the element it applies to while the &lsquo;<a
   href="#wrap-margin"><code class=property>wrap-margin</code></a>&rsquo;
   property affects layout of content outside the element.</div>
  <!-- End section "Scope and Effect of Exclusions" -->

  <h3 id=propagation-of-exclusions><span class=secno>3.3. </span>Propagation
   of Exclusions</h3>

  <p> By default, an element inherits its parent <a
   href="#wrapping-context">wrapping context</a>. In other words it is
   subject to the exclusions defined <a href="#outside-and-inside"
   title=outside-inside>outside the element. </a>

  <p>Setting the &lsquo;<a href="#wrap-through"><code
   class=property>wrap-through</code></a>&rsquo; property to &lsquo;<code
   class=property>none</code>&rsquo; prevents an element from inheriting its
   parent wrapping context. In other words, exclusions defined &lsquo;<code
   class=property>outside</code>&rsquo; the element, have not effect on the
   element's children layout.

  <div class=note> Exclusions defined by an element's descendants still
   contribute to their containing block's <a
   href="#wrapping-context">wrapping context</a>. If that containing block is
   a child of an element with &lsquo;<a href="#wrap-through"><code
   class=property>wrap-through</code></a>&rsquo; set to none, or the element
   itself, then exclusion still have an effect on the children of that
   containing block element.</div>

  <h4 id=wrap-through-property><span class=secno>3.3.1. </span>The &lsquo;<a
   href="#wrap-through"><code class=property>wrap-through</code></a>&rsquo;
   Property</h4>

  <div class=issue-marker data-bug_id=15085 data-bug_status=NEW> <a
   href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15085">Bug-15085</a>
   <div class=issue-details>
    <p class=short-desc>do we need wrap-through?</p>
   </div>
  </div>

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

     <td><dfn id=wrap-through title="'wrap-through'">wrap-through</dfn>

    <tr>
     <th>Value:

     <td><a href="#wrap0"><var>wrap</var></a> | <var>none</var>

    <tr>
     <th>Initial:

     <td>wrap

    <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&nbsp;value:

     <td>as specified
  </table>

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

  <dl>
   <dt><dfn id=wrap title="'wrap-through'!!'wrap'">wrap</dfn>

   <dd> The element inherits its parent node's <a
    href="#wrapping-context">wrapping context</a>. Its descendant inline
    content wraps around exclusions defined <a href="#outside-and-inside"
    title=outside-inside>outside</a> the element.
  </dl>

  <dl>
   <dt><dfn id=none title="'wrap-through'!!'none'">none</dfn>

   <dd> The element does not inherit its parent node's <a
    href="#wrapping-context">wrapping context</a>. Its descendants are only
    subject to exclusion shapes defined <a href="#outside-and-inside"
    title=outside-inside>inside</a> the element.
  </dl>

  <div class=example>
   <p> Using the &lsquo;<a href="#wrap-through"><code
    class=property>wrap-through</code></a>&rsquo; property to control the
    effect of exclusions.</p>

   <pre><code class=html>
&lt;style type="text/css"&gt;
    .exclusion  {
    	wrap-flow: both;
    	position: absolute;
    	background-color: rgba(220, 230, 242, 0.5);
    }
&lt;/style&gt;

&lt;div style=”position: relative;”&gt;
    &lt;div class=”exclusion”&gt;&lt;/div&gt;
    &lt;div style=”wrap-through: wrap;”&gt; Lorem ipsum dolor sit amet...&lt;/div&gt;
    &lt;div style=”wrap-through: none;”&gt; Lorem ipsum dolor sit amet...&lt;/div&gt;
&lt;/div&gt;
</code><
1E68
/pre>
   <img alt="Example rendering of wrap-through: wrap | none"
   class=singleImgExample src="images/exclusion_wrap_through.png"
   style="max-width:40%"></div>
  <!-- End section "wrap-through property" -->

  <h4 id=wrap-shorthand-property><span class=secno>3.3.2. </span>The
   &lsquo;<a href="#wrap0"><code class=property>wrap</code></a>&rsquo;
   Shorthand Property</h4>

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

     <td><dfn id=wrap0 title="'wrap'">wrap</dfn>

    <tr>
     <th>Value:

     <td><var>&lt;wrap-flow&gt;</var> || <var>&lt;wrap-margin&gt;</var> [ /
      <var>&lt;wrap-padding&gt;</var>]

    <tr>
     <th>Initial:

     <td>see individual properties

    <tr>
     <th>Applies to:

     <td>block-level elements