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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&product=CSS&component=Shapes&resolution=---&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--
CB92
>
<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( <<shape-arg>>{4} [
round <<‘<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 <<‘<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>
<style>
div {
height: 400px;
width: 400px;
}
.in-a-circle {
shape-outside: url(#circle_shape);
}
.in-a-path {
shape-outside: url(#path-shape);
}
</style>
<svg ...>
<circle id="circle_shape" cx="50%" cy="50%" r="50%" />
<path id="path-shape" d="M 100 100 L 300 100 L 200 300 z" />
</svg>
<div class="around-a-circle">...</div>
<div class="around-a-path">...</div>
</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>
<style type="text/css">
.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;
}
</style>
<div style=”position: relative;”>
<div class=”exclusion”></div>
Lorem ipsum dolor sit amet...
</div>
</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><basic-shape></var></a> | <a
href="#lturigt"><var><uri></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 <basic-shape>, the absolute URI for
<uri>, 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><basic-shape></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><uri></dfn>
<dd> If the <uri> references an SVG shape element, that element
defines the shape. Otherwise, if the <uri> references an image, the
shape is extracted and computed based on the alpha channel of the
specified image. If the <uri> 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><length></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><basic-shape>, <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><uri>, <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>
<th><a class=property href="#shape-inside">shape-inside</a>
<td>outside-shape | auto | <basic-shape> | <uri>
<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><length>
<td>0
<td>block-level elements
<td>no
<td>N/A
<td>visual
</table>
<!--end-properties-->
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<script type="text/javascript">
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<h2 class=no-num id=change-log>Change Log</h2>
</html>
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