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<!doctype html>
<html lang="en">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>CSS Backgrounds and Borders Module Level 4</title>
<meta content="exploring" name=
785B
"csswg-work-status">
<meta content="ED" name="w3c-status">
<link href="../default.css" rel="stylesheet" type="text/css">
<link href="../csslogo.ico" rel="shortcut icon" type="image/x-icon">
<style>
body {
background: url("https://www.w3.org/StyleSheets/TR/logo-ED") top left no-repeat white;
background-attachment: fixed;
color: black;
font-family: sans-serif;
margin: 0 auto;
max-width: 50em;
padding: 2em 1em 2em 70px;
}
:link { color: #00C; background: transparent }
:visited { color: #609; background: transparent }
a[href]:active { color: #C00; background: transparent }
a[href]:hover { background: #ffa }
a[href] img { border-style: none }
h1, h2, h3, h4, h5, h6 { text-align: left }
h1, h2, h3 { color: #005A9C; }
h1 { font: 170% sans-serif }
h2 { font: 140% sans-serif }
h3 { font: 120% sans-serif }
h4 { font: bold 100% sans-serif }
h5 { font: italic 100% sans-serif }
h6 { font: small-caps 100% sans-serif }
.hide { display: none }
div.head { margin-bottom: 1em }
div.head h1 { margin-top: 2em; clear: both }
div.head table { margin-left: 2em; margin-top: 2em }
p.copyright { font-size: small }
p.copyright small { font-size: small }
pre { margin-left: 2em }
dt { font-weight: bold }
ul.toc, ol.toc {
list-style: none;
}
</style>
<meta content="Bikeshed 1.0.0" name="generator">
</head>
<body class="h-entry">
<div class="head">
<p data-fill-with="logo"><a class="logo" href="http://www.w3.org/">
<img alt="W3C" height="48" src="https://www.w3.org/Icons/w3c_home" width="72">
</a>
</p>
<h1 class="p-name no-ref" id="title">CSS Backgrounds and Borders Module Level 4</h1>
<h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft,
<time class="dt-updated" datetime="2015-08-14">14 August 2015</time></span></h2>
<div data-fill-with="spec-metadata">
<dl>
<dt>This version:
<dd><a class="u-url" href="http://dev.w3.org/csswg/css-backgrounds-4/">http://dev.w3.org/csswg/css-backgrounds-4/</a>
<dt>Latest version:
<dd><a href="http://www.w3.org/TR/css-backgrounds-4/">http://www.w3.org/TR/css-backgrounds-4/</a>
<dt>Feedback:
<dd><span><a href="mailto:www-style@w3.org?subject=%5Bcss-backgrounds%5D%20YOUR%20TOPIC%20HERE">www-style@w3.org</a> with subject line “<kbd>[css-backgrounds] <var>… message topic …</var></kbd>” (<a href="http://lists.w3.org/Archives/Public/www-style/" rel="discussion">archives</a>)</span>
<dt>Issue Tracking:
<dd><a href="https://github.com/w3c/csswg-drafts/issues/">GitHub</a>
<dd><a href="#issues-index">Inline In Spec</a>
<dt class="editor">Editors:
<dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:bert@w3.org">Bert Bos</a> (<span class="p-org org">W3C</span>)
<dd class="editor p-author h-card vcard"><a class="p-name fn u-url url" href="http://fantasai.inkedblade.net/contact">Elika J. Etemad</a> (<span class="p-org org">Invited Expert</span>)
<dd class="editor p-author h-card vcard"><a class="p-name fn u-url url" href="http://lea.verou.me/about/">Lea Verou</a> (<span class="p-org org">Invited Expert</span>)
</dl>
</div>
<div data-fill-with="warning">
<details class="annoying-warning" open="">
<summary>Not Ready For Implementation</summary>
<p>
This spec is not yet ready for implementation.
It exists in this repository to record the ideas and promote discussion.
</p>
<p>
Before attempting to implement this spec,
please contact the CSSWG at www-style@w3.org.
</p>
</details>
</div>
<p class="copyright" data-fill-with="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2015 <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>). 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>
<hr title="Separator for header">
</div>
<h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
<div class="p-summary" data-fill-with="abstract">
<p>This module contains the features of CSS relating to the borders and backgrounds of boxes on the page. It includes and extends the functionality of <a href="http://www.w3.org/TR/css3-background/">CSS Backgrounds and Borders Level 3</a>. <a data-link-type="biblio" href="#biblio-css3bg">[CSS3BG]</a> The main extensions compared to level 3 are shaping (<a class="property" data-link-type="propdesc" href="#propdef-corner-shape">corner-shape</a>) and clipping borders (<a class="property" data-link-type="propdesc" href="#propdef-border-clip">border-clip</a>), logical background positions (<a class="property" data-link-type="propdesc" href="#propdef-background-position">background-position</a>), and the <span class="css">extend</span> ability of <a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css2/colors.html#propdef-background-repeat">background-repeat</a>.</p>
<a href="http://www.w3.org/TR/CSS/">CSS</a> is a language for describing the rendering of structured documents
(such as HTML and XML)
on screen, on paper, in speech, etc.</div>
<h2 class="no-num no-toc no-ref heading settled" id="status"><span class="content">Status of this document</span></h2>
<div data-fill-with="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>
<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=%5Bcss-backgrounds%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 “css-backgrounds” in the subject,
preferably like this:
“[css-backgrounds] <em>…summary of comment…</em>”
</p>
<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>
<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>
<p>
This document is governed by the <a href="http://www.w3.org/2014/Process-20140801/" id="w3c_process_revision">1 August 2014 W3C Process Document</a>.
</p>
<p>
</p></div>
<div data-fill-with="at-risk"></div>
<h2 class="no-num no-toc no-ref heading settled" id="contents"><span class="content">Table of Contents</span></h2>
<div data-fill-with="table-of-contents" role="navigation">
<ul class="toc" role="directory">
<li><a href="#intro"><span class="secno">1</span> <span class="content">
Introduction</span></a>
<li><a href="#backgrounds"><span class="secno">2</span> <span class="content">
Backgrounds</span></a>
<ul class="toc">
<li><a href="#the-background-position"><span class="secno">2.1</span> <span class="content">
Background Positioning: the <span class="property">background-position</span> shorthand property</span></a>
<ul class="toc">
<li><a href="#background-position-longhands"><span class="secno">2.1.1</span> <span class="content">
Background Positioning Longhands: the <span class="property">background-position-x</span>, <span class="property">background-position-y</span>, <span class="property">background-position-inline</span>, and <span class="property">background-position-block</span> properties</span></a>
</ul>
</ul>
<li><a href="#corners"><span class="secno">3</span> <span class="content">
Corners</span></a>
<ul class="toc">
<li><a href="#corner-sizing"><span class="secno">3.1</span> <span class="content">
Corner Sizing: the 'border-radius property</span></a>
<li><a href="#corner-shaping"><span class="secno">3.2</span> <span class="content">
Corner Shaping: the <span class="property">corner-shape</span> property</span></a>
<li><a href="#corners-shorthand"><span class="secno">3.3</span> <span class="content">
Corner Shape and Size: the <span class="property">corners</span> shorthand</span></a>
</ul>
<li><a href="#partial-borders"><span class="secno">4</span> <span class="content">
Partial borders</span></a>
<ul class="toc">
<li><a href="#border-limit"><span class="secno">4.1</span> <span class="content">
Partial Borders: the <span class="property">border-limit</span> property</span></a>
<li><a href="#border-clip"><span class="secno">4.2</span> <span class="content">
The <span class="property">border-clip</span> properties</span></a>
</ul>
<li><a href="#changes"><span class="secno">5</span> <span class="content">
Changes</span></a>
<ul class="toc">
<li><a href="#level-changes"><span class="secno">5.1</span> <span class="content">
Additions Since Level 3</span></a>
</ul>
<li><a href="#acknowledgments"><span class="secno">6</span> <span class="content">Acknowledgments</span></a>
<li><a href="#conformance"><span class="secno"></span> <span class="content">
Conformance</span></a>
<ul class="toc">
<li><a href="#conventions"><span class="secno"></span> <span class="content">
Document conventions</span></a>
<li><a href="#conformance-classes"><span class="secno"></spa
12CF
n> <span class="content">
Conformance classes</span></a>
<li><a href="#partial"><span class="secno"></span> <span class="content">
Partial implementations</span></a>
<li><a href="#experimental"><span class="secno"></span> <span class="content">
Experimental implementations</span></a>
<li><a href="#testing"><span class="secno"></span> <span class="content">
Non-experimental implementations</span></a>
</ul>
<li><a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
<ul class="toc">
<li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
<li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
</ul>
<li><a href="#references"><span class="secno"></span> <span class="content">References</span></a>
<ul class="toc">
<li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
<li><a href="#informative"><span class="secno"></span> <span class="content">Informative References</span></a>
</ul>
<li><a href="#property-index"><span class="secno"></span> <span class="content">Property Index</span></a>
<li><a href="#issues-index"><span class="secno"></span> <span class="content">Issues Index</span></a>
</ul></div>
<main>
<h2 class="heading settled" data-level="1" id="intro"><span class="secno">1. </span><span class="content">
Introduction</span><a class="self-link" href="#intro"></a></h2>
<p class="issue" id="issue-648e34a3"><a class="self-link" href="#issue-648e34a3"></a>
This module is currently maintained as a diff against Level 3.
We will fold in the text once it’s all formatted up and in CR again,
as this will reduce the effort of keeping them in sync
(source diffs will be accurate in reflecting the differences).
</p>
<h2 class="heading settled" data-level="2" id="backgrounds"><span class="secno">2. </span><span class="content">
Backgrounds</span><a class="self-link" href="#backgrounds"></a></h2>
<h3 class="heading settled" data-level="2.1" id="the-background-position"><span class="secno">2.1. </span><span class="content">
Background Positioning: the <a class="property" data-link-type="propdesc" href="#propdef-background-position">background-position</a> shorthand property</span><a class="self-link" href="#the-background-position"></a></h3>
<table class="definition propdef" data-link-for-hint="background-position">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-background-position">background-position<a class="self-link" href="#propdef-background-position"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod"><a class="production css" data-link-type="type" href="#typedef-position"><position></a><a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-comma">#</a>
<tr>
<th>Initial:
<td>top left
<tr>
<th>Applies to:
<td>all
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>refer to size of background positioning area <em>minus</em> size of background image
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>A list, each item consisting of: a pair of offsets and an origin, each offset given as a combination of an absolute length and a percentage
<tr>
<th>Animatable:
<td>no</table>
<p>See <a data-link-type="biblio" href="#biblio-css3bg">[CSS3BG]</a> for definition.</p>
<p>Where
</p>
<pre class="prod"><dfn data-dfn-type="type" data-export="" id="typedef-position"><var><position></var><a class="self-link" href="#typedef-position"></a></dfn> = [ [ left <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> right <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> top <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> bottom <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> end <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]
<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a>
[ left <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> right <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> x-start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> x-end <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]
[ top <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> bottom <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> y-start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> y-end <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]
<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a>
[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ left <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> right <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> x-start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> x-end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ] &&
[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ top <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> bottom <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> y-start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> y-end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ]
<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a>
[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ]
[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ] ]</pre>
<p>Values have the following meanings:</p>
<dl>
<dt>One value
<dd>
If only one value is given,
and that value is <span class="css">start</span> or <span class="css">end</span>,
then the keyword is duplicated;
otherwise the second keyword defaults to <span class="css">center</span>.
The resulting value is treated as a two-component value.
<dt>More than one value
<dd>
If the value contains a <span class="css">start</span> or <span class="css">end</span> keyword,
then the shorthand sets
<a class="property" data-link-type="propdesc" href="#propdef-background-position-inline">background-position-inline</a> and <a class="property" data-link-type="propdesc" href="#propdef-background-position-block">background-position-block</a> to the specified values.
Otherwise
the shorthand sets
<a class="property" data-link-type="propdesc" href="#propdef-background-position-x">background-position-x</a> and <a class="property" data-link-type="propdesc" href="#propdef-background-position-y">background-position-y</a> to the specified values.
<p class="issue" id="issue-e752f96e"><a class="self-link" href="#issue-e752f96e"></a> Specify the value assignment in more detail. Should expand just like Level 3.</p>
</dl>
<p class="issue" id="issue-f4a1aeb0"><a class="self-link" href="#issue-f4a1aeb0"></a> Specify what happens to set of properties that are not set. Maybe they’re just not set?</p>
<h4 class="heading settled" data-level="2.1.1" id="background-position-longhands"><span class="secno">2.1.1. </span><span class="content">
Background Positioning Longhands: the <a class="property" data-link-type="propdesc" href="#propdef-background-position-x">background-position-x</a>, <a class="property" data-link-type="propdesc" href="#propdef-background-position-y">background-position-y</a>, <a class="property" data-link-type="propdesc" href="#propdef-background-position-inline">background-position-inline</a>, and <a class="property" data-link-type="propdesc" href="#propdef-background-position-block">background-position-block</a> properties</span><a class="self-link" href="#background-position-longhands"></a></h4>
<p class="issue" id="issue-67389536"><a class="self-link" href="#issue-67389536"></a> This section is still being worked out. The tricky thing is making all the start/end keywords work sanely.</p>
<p class="issue" id="issue-9792c5df"><a class="self-link" href="#issue-9792c5df"></a> Initial values are incompatible.</p>
<table class="definition propdef" data-link-for-hint="background-position-x">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-background-position-x">background-position-x<a class="self-link" href="#propdef-background-position-x"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod">[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ left <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> right <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> x-start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> x-end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-comma">#</a>
<tr>
<th>Initial:
<td>left
<tr>
<th>Applies to:
<td>all
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>refer to width of background positioning area <em>minus</em> height of background image
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
<tr>
<th>Animatable:
<td>no</table>
<p>This property specifies the background position’s horizontal component.</p>
<table class="definition propdef" data-link-for-hint="background-position-y">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-background-position-y">background-position-y<a class="self-link" href="#propdef-background-position-y"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod">[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ top <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> bottom <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> y-start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> y-end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-comma">#</a>
<tr>
<th>Initial:
<td>left
<tr>
<th>Applies to:
<td>all
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>refer to height of background positioning area <em>minus</em> height of background image
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
<tr>
<th>Animatable:
<td>no</table>
<p>This property specifies the background position’s vertical component.</p>
<table class="definition propdef" data-link-for-hint="background-position-inline">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-background-position-inline">background-position-inline<a class="self-link" href="#propdef-background-position-inline"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod">[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one"&g
12CF
t;|</a> end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-comma">#</a>
<tr>
<th>Initial:
<td>start
<tr>
<th>Applies to:
<td>all
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>refer to inline-size of background positioning area <em>minus</em> inline-size of background image
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
<tr>
<th>Animatable:
<td>no</table>
<p>This property specifies the background position’s inline-axis component.</p>
<table class="definition propdef" data-link-for-hint="background-position-block">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-background-position-block">background-position-block<a class="self-link" href="#propdef-background-position-block"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod">[ center <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> [ start <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> end ] [ <var><percentage></var> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <var><length></var> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-comma">#</a>
<tr>
<th>Initial:
<td>start
<tr>
<th>Applies to:
<td>all
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>refer to size of background positioning area <em>minus</em> size of background image
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
<tr>
<th>Animatable:
<td>no</table>
<p>This property specifies the background position’s block-axis component.</p>
<h2 class="heading settled" data-level="3" id="corners"><span class="secno">3. </span><span class="content">
Corners</span><a class="self-link" href="#corners"></a></h2>
<h3 class="heading settled" data-level="3.1" id="corner-sizing"><span class="secno">3.1. </span><span class="content">
Corner Sizing: the 'border-radius property</span><a class="self-link" href="#corner-sizing"></a></h3>
<table class="definition propdef" data-link-for-hint="border-radius">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-radius">border-radius<a class="self-link" href="#propdef-border-radius"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod">[ <a class="production css" data-link-type="type" href="https://drafts.csswg.org/css-values-3/#length-value"><length></a> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <a class="production css" data-link-type="type" href="https://drafts.csswg.org/css-values-3/#percentage-value"><percentage></a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-num-range">{1,4}</a> [ / [ <a class="production css" data-link-type="type" href="https://drafts.csswg.org/css-values-3/#length-value"><length></a> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> <a class="production css" data-link-type="type" href="https://drafts.csswg.org/css-values-3/#percentage-value"><percentage></a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-num-range">{1,4}</a> ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-opt">?</a>
<tr>
<th>Initial:
<td>0
<tr>
<th>Applies to:
<td>all elements, except table element when <a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css2/tables.html#propdef-border-collapse">border-collapse</a> is <a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-ruby-1/#valdef-ruby-merge-collapse">collapse</a>
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>n/a
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>specified value
<tr>
<th>Animatable:
<td>no
<tr>
<th>Canonical order:
<td>n/a</table>
<p>See <a data-link-type="biblio" href="#biblio-css3bg">[CSS3BG]</a>.</p>
<h3 class="heading settled" data-level="3.2" id="corner-shaping"><span class="secno">3.2. </span><span class="content">
Corner Shaping: the <a class="property" data-link-type="propdesc" href="#propdef-corner-shape">corner-shape</a> property</span><a class="self-link" href="#corner-shaping"></a></h3>
<table class="definition propdef" data-link-for-hint="corner-shape">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" da
9E01
ta-export="" id="propdef-corner-shape">corner-shape<a class="self-link" href="#propdef-corner-shape"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod">[round <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> bevel <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> scoop <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-one">|</a> notch]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#mult-num-range">{1,4}</a>
<tr>
<th>Initial:
<td>round
<tr>
<th>Applies to:
<td>all elements, except table element when <a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css2/tables.html#propdef-border-collapse">border-collapse</a> is <a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-ruby-1/#valdef-ruby-merge-collapse">collapse</a>
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>n/a
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>specified value
<tr>
<th>Animatable:
<td>no
<tr>
<th>Canonical order:
<td>n/a</table>
<p>By default, non-zero border-radii define
a quarter-ellipse that rounds the affected corners.
However in some cases, other corner shapes are desired.
The <a class="property" data-link-type="propdesc" href="#propdef-corner-shape">corner-shape</a> property specifies a reinterpretation of the radii
to define other corner shapes.</p>
<dl>
<dt><dfn class="css" data-dfn-for="corner-shape" data-dfn-type="value" data-export="" id="valdef-corner-shape-round"><a class="css" data-link-type="maybe" href="#valdef-corner-shape-round">round</a><a class="self-link" href="#valdef-corner-shape-round"></a></dfn>
<dd>Border radii define a convex elliptical curve at the corner.
<dt><dfn class="css" data-dfn-for="corner-shape" data-dfn-type="value" data-export="" id="valdef-corner-shape-bevel"><a class="css" data-link-type="maybe" href="#valdef-corner-shape-bevel">bevel</a><a class="self-link" href="#valdef-corner-shape-bevel"></a></dfn>
<dd>Border radii define a diagonal slice at the corner.
<dt><dfn class="css" data-dfn-for="corner-shape" data-dfn-type="value" data-export="" id="valdef-corner-shape-scoop"><a class="css" data-link-type="maybe" href="#valdef-corner-shape-scoop">scoop</a><a class="self-link" href="#valdef-corner-shape-scoop"></a></dfn>
<dd>Border radii define a concave elliptical curve at the corner.
<dt><dfn class="css" data-dfn-for="corner-shape" data-dfn-type="value" data-export="" id="valdef-corner-shape-notch"><a class="css" data-link-type="maybe" href="#valdef-corner-shape-notch">notch</a><a class="self-link" href="#valdef-corner-shape-notch"></a></dfn>
<dd>Border radii define a concave rectangular notch at the corner.
</dl>
<div class="example" id="example-eb5dcbed"><a class="self-link" href="#example-eb5dcbed"></a>
For example, the following declarations create a right-pointing next button.
<pre>a {
border-radius: 0 2em 2em 0;
corner-shape: bevel;
padding: 0.5em 2em 0.5em 0.5em;
</pre>
<p>As a fallback in UAs that don’t support <a class="property" data-link-type="propdesc" href="#propdef-border-radius">border-radius</a>,
the right side would be rounded rather than pointy.</p>
</div>
<p class="issue" id="issue-7e3f29b5"><a class="self-link" href="#issue-7e3f29b5"></a>
For <a class="css" data-link-type="maybe" href="#valdef-corner-shape-scoop">scoop</a> and <a class="css" data-link-type="maybe" href="#valdef-corner-shape-notch">notch</a>, how do the color/style/width transitions work?
Do they transition once in the middle, or alternate to match the topness/sideness of that segment of the border?
</p>
<p class="issue" id="issue-cba02f09"><a class="self-link" href="#issue-cba02f09"></a>
Add a <a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-transitions-1/#funcdef-cubic-bezier">cubic-bezier()</a> function for random other shapes?
Or some other functions?
</p>
<h3 class="heading settled" data-level="3.3" id="corners-shorthand"><span class="secno">3.3. </span><span class="content">
Corner Shape and Size: the <a class="property" data-link-type="propdesc" href="#propdef-corners">corners</a> shorthand</span><a class="self-link" href="#corners-shorthand"></a></h3>
<table class="definition propdef" data-link-for-hint="corners">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-corners">corners<a class="self-link" href="#propdef-corners"></a></dfn>
<tr class="value">
<th>Value:
<td class="prod"><a class="production" data-link-type="propdesc" href="#propdef-corner-shape"><‘corner-shape’></a> <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-3/#comb-any">||</a> <a class="production" data-link-type="propdesc" href="#propdef-border-radius"><‘border-radius’></a>
<tr>
<th>Initial:
<td>see individual properties
<tr>
<th>Applies to:
<td>see individual properties
<tr>
<th>Inherited:
<td>see individual properties
<tr>
<th>Percentages:
<td>see individual properties
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>see individual properties
<tr>
<th>Animatable:
<td>no</table>
<p>The <a class="property" data-link-type="propdesc" href="#propdef-corners">corners</a> shorthand sets <a class="property" data-link-type="propdesc" href="#propdef-corner-shape">corner-shape</a> and <a class="property" data-link-type="propdesc" href="#propdef-border-radius">border-radius</a> in the same declaration.
If either is omitted, it is reset to its initial value.</p>
<div class="example" id="example-9b886b19"><a class="self-link" href="#example-9b886b19"></a>
For example, the following declaration creates a diamond shape.
<pre>corners: bevel 50%;</pre>
<p>In UAs that don’t support <a class="property" data-link-type="propdesc" href="#propdef-corner-shape">corner-shape</a>, the declaration is ignored
(falls back to a rectangle).</p>
</div>
<div class="example" id="example-0f55a243"><a class="self-link" href="#example-0f55a243"></a>
In this example, the first declaration creates tabs with vertical sides and rounded corners using <a class="property" data-link-type="propdesc" href="#propdef-border-radius">border-radius</a>,
while the second example makes them trapezoid-shaped in UAs that support <a class="property" data-link-type="propdesc" href="#propdef-corners">corners</a>.
<pre>border-radius: 0.25em 0.25em 0 0;
corners: bevel 0.25em 0.25em 0 0 / 50% 50% 0 0;
</pre>
</div>
<h2 class="heading settled" data-level="4" id="partial-borders"><span class="secno">4. </span><span class="content">
Partial borders</span><a class="self-link" href="#partial-borders"></a></h2>
<p>CSS borders traditionally cover an entire border edge. Sometimes,
however, it can be useful to hide some parts of the border.
</p>
<p class="issue" id="issue-32661c58"><a class="self-link" href="#issue-32661c58"></a>
Here are two proposals for doing this:
the second one is from GCPM, the first one is an attempt to recast it more readably.
The names are terrible, known problem, proposals accepted.
There is a problem with conceiving this as clipping:
if you have dotted borders, you want whole dots always, not parts of dots.
So it should be a drawing limit, not a clip.
</p>
<h3 class="heading settled" data-level="4.1" id="border-limit"><span class="secno">4.1. </span><span class="content">
Partial Borders: the <a class="property" data-link-type="propdesc" href="#propdef-border-limit">border-limit</a> property</span><a class="self-link" href="#border-limit"></a></h3>
<table class="propdef">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-limit">border-limit<a class="self-link" href="#propdef-border-limit"></a></dfn>
<tr>
<th>Value:
<td>all | [ sides | corners ] [ <length> | <percentage> ]?
| [ top | right | bottom | left ] [ <length> | <percentage> ]
<tr>
<th>Initial:
<td>round
<tr>
<th>Applies to:
<td>all elements, except table element when <a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css2/tables.html#propdef-border-collapse">border-collapse</a> is
<a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-ruby-1/#valdef-ruby-merge-collapse">collapse</a>
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>relative to border-box
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>as specified
</table>
<p>By default, the entire border is drawn. However, border rendering can be
limited to only part of a border. The keyword specifies which part, and
the length or percentage specifies how much.
</p>
<dl>
<dt><dfn class="css" data-dfn-for="border-limit" data-dfn-type="value" data-export="" id="valdef-border-limit-sides"><a class="css" data-link-type="maybe" href="#valdef-border-limit-sides">sides</a><a class="self-link" href="#valdef-border-limit-sides"></a></dfn>
<dd>The sides are drawn up to but not including the corners (as defined
by the border radii). A length or percentage is measured from the center
of each side: <span class="css">50%</span> draws the middle 50% of the border; by default the
entire side is drawn.
<dt><dfn class="css" data-dfn-for="border-limit" data-dfn-type="value" data-export="" id="valdef-border-limit-corners"><a class="css" data-link-type="maybe" href="#valdef-border-limit-corners">corners</a><a class="self-link" href="#valdef-border-limit-corners"></a></dfn>
<dd>The corners are drawn plus the specified distance into the sides if
specified. A length is measured from the closest edge of the corner area.
A percentage is measured from the absolute corner of the border box.
<dt><dfn class="css" data-dfn-for="border-limit&
8096
quot; data-dfn-type="value" data-export="" id="valdef-border-limit-left"><a class="css" data-link-type="maybe" href="#valdef-border-limit-left">left</a><a class="self-link" href="#valdef-border-limit-left"></a></dfn>
<dt><dfn class="css" data-dfn-for="border-limit" data-dfn-type="value" data-export="" id="valdef-border-limit-right"><a class="css" data-link-type="maybe" href="#valdef-border-limit-right">right</a><a class="self-link" href="#valdef-border-limit-right"></a></dfn>
<dd>For the left and right (vertical) sides, draws the entire side and
corner. For the top and bottom (horizontal) sides, draws the left/right
portion, as specified. Distances are measured as for <a class="css" data-link-type="maybe" href="#valdef-border-limit-corners">corners</a>.
<dt><dfn class="css" data-dfn-for="border-limit" data-dfn-type="value" data-export="" id="valdef-border-limit-top"><a class="css" data-link-type="maybe" href="#valdef-border-limit-top">top</a><a class="self-link" href="#valdef-border-limit-top"></a></dfn>
<dt><dfn class="css" data-dfn-for="border-limit" data-dfn-type="value" data-export="" id="valdef-border-limit-bottom"><a class="css" data-link-type="maybe" href="#valdef-border-limit-bottom">bottom</a><a class="self-link" href="#valdef-border-limit-bottom"></a></dfn>
<dd>For the top and bottom (horizontal) sides, draws the entire side and
corner. For the left and right (vertical) sides, draws the top/bottom
portion, as specified. Distances are measured as for <a class="css" data-link-type="maybe" href="#valdef-border-limit-corners">corners</a>.
</dl>
<div class="example" id="example-211cc22c"><a class="self-link" href="#example-211cc22c"></a>
<p>The following example draws only the middle 50% of the sides.</p>
<pre>box { border: solid; border-parts: sides 50% }</pre>
<p>The following example draws only the curved parts of the corners.</p>
<pre>box { border: solid; border-radius: 1em 2em; border-parts: corners; }</pre>
<p>The following example draws only the left 4em of the top border.</p>
<pre>box { border-top: solid; border-parts: left 4em; }
<p>The following example draws only the first 10px of each corner:</p>
<pre>box { border: solid; border-parts: corners 10px; }</pre>
<p>The following example draws the curved part of the corner plus 5px
along ths sides:</p>
<pre>box { border: solid; border-radius: 5px; border-shape: scoop; border-parts: corners 5px; }</pre>
<p>The following example draws the curved part of the corner and all of
the side except the middle 40%.</p>
<pre>box { border: solid; border-radius: 5px; border-shape: scoope; border-parts: corners 30%; }</pre> </pre>
</div>
<h3 class="heading settled" data-level="4.2" id="border-clip"><span class="secno">4.2. </span><span class="content">
The <a class="property" data-link-type="propdesc" href="#propdef-border-clip">border-clip</a> properties</span><a class="self-link" href="#border-clip"></a></h3>
<table class="propdef">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-clip">border-clip<a class="self-link" href="#propdef-border-clip"></a></dfn>, <dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-clip-top">border-clip-top<a class="self-link" href="#propdef-border-clip-top"></a></dfn>, <dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-clip-right">border-clip-right<a class="self-link" href="#propdef-border-clip-right"></a></dfn>, <dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-clip-bottom">border-clip-bottom<a class="self-link" href="#propdef-border-clip-bottom"></a></dfn>, <dfn class="css" data-dfn-type="property" data-export="" id="propdef-border-clip-left">border-clip-left<a class="self-link" href="#propdef-border-clip-left"></a></dfn>
<tr>
<th>Value:
<td>normal | [ <length> | <percentage> | <fraction> ]+
<tr>
<th>Initial:
<td>normal
<tr>
<th>Applies to:
<td>all elements
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>refer to length of border-edge side
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td><span class="css">normal</span>, or a list consisting of absolute lengths, or percentages as specified
</table>
<p class="issue" id="issue-14d9ac8f"><a class="self-link" href="#issue-14d9ac8f"></a>Should these properties be simplified to only accept <code>normal | [ <length> | <percentage> ] +</code>?
</p>
<p>These properties split their respective borders into parts along
the border edge. The first part is visible, the second is invisible,
the third part is visible, etc. Parts can be specified with lengths,
percentages, or fractions (expressed by the <span class="css">fr</span> unit, as per
<a data-link-type="biblio" href="#biblio-css3grid">[CSS3GRID]</a> or its <a href="http://dev.w3.org/csswg/css3-grid/">editor’s
edition</a>).
The <span class="css">normal</span> value means
that the border is not split, but shown normally.
</p>
<p><a class="property" data-link-type="propdesc" href="#propdef-border-clip">border-clip</a> is a shorthand property for the four individual properties.
</p>
<p>If the listed parts are shorter than the border, any remaining
border is split proportionally between the specified fractions. If
there are no fractions, the behavior is as if <span class="css">1fr</span> had been
specified at the end of the list.
</p>
<p>If the listed parts are longer than the border, the specified parts
will be shown in full until the end of the border. In this case, all
fractions will be zero.
</p>
<p>For horizontal borders, parts are listed from left to right. For
vertical borders, parts are listed from top to bottom.
</p>
<p>The exact border parts are determined by laying out the specified border
parts with all fractions initially set to zero. Any remaining border is
split proportionally between the fractions specified.
</p>
<div class="example" id="example-fdd9a140"><a class="self-link" href="#example-fdd
5FF1
9a140"></a>
<pre>border-clip: 10px 1fr 10px;</pre>
<div style="position: relative; width: 250px; height: 150px; background: white;">
<div style="border: 2px solid black; width: 200px; height: 100px; position: absolute; top: 20px; left: 20px">
<div style="position: absolute; background: white; left: 15px; top: -5px; height: 110px; width: 170px"></div>
<div style="position: absolute; background: white; left: -5px; top: 15px; height: 70px; width: 210px"></div>
</div>
</div>
</div>
<div class="example" id="example-d6a76cbb"><a class="self-link" href="#example-d6a76cbb"></a>
<pre>border-clip-top: 10px 1fr 10px;
border-clip-bottom: 10px 1fr 10px;
border-clip-right: 5px 1fr 5px;
border-clip-left: 5px 1fr 5px;
</pre>
<div style="position: relative; width: 250px; height: 150px; background: white;">
<div style="border: 2px solid black; width: 200px; height: 100px; position: absolute; top: 20px; left: 20px">
<div style="position: absolute; background: white; left: 15px; top: -5px; height: 110px; width: 170px"></div>
<div style="position: absolute; background: white; left: -5px; top: 5px; height: 90px; width: 210px"></div>
</div>
</div>
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