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[css3-values] Make attr() invalid if it uses an undeclared namespace prefix.
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‎css3-values/Overview.html‎

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"http://www.w3.org/TR/html4/strict.dtd">
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<html lang=en>
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<head><meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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<head profile="http://dublincore.org/documents/2008/08/04/dc-html/ ">
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<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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<title>CSS Values and Units Module Level 3</title>
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<link href="http://purl.org/dc/terms/" rel=schema.dcterms>
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<link href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
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rel=dcterms.rights>
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<meta content="CSS Values and Units Module Level 3" name=dcterms.title>
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<meta content=text name=dcterms.type>
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<meta content=2012-10-16 name=dcterms.issued>
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<meta content="http://dev.w3.org/csswg/css3-values/" name=dcterms.creator>
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<meta content=W3C name=dcterms.publisher>
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<meta content="http://www.w3.org/TR/2012/ED-css3-values-20121016/"
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name=dcterms.identifier>
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<style type="text/css">
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code, small { white-space: nowrap }
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.say { color: gray; }
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</style>
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<link href="../default.css" rel=stylesheet type="text/css">
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<link href="http://www.w3.org/StyleSheets/TR/W3C-ED.css" rel=stylesheet
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type="text/css">
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type="text/css">
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<body>
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<div class=head> <!--begin-logo-->
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<h1>CSS Values and Units Module Level 3</h1>
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<h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 27 August 2012</h2>
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<h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 16 October
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2012</h2>
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<dl>
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<dt>This version:
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<dd><a
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href="http://www.w3.org/TR/2012/ED-css3-values-20120827/">http://www.w3.org/TR/2012/ED-css3-values-20120827/</a>
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href="http://www.w3.org/TR/2012/ED-css3-values-20121016/">http://www.w3.org/TR/2012/ED-css3-values-20121016/</a>
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<dt>Latest version:
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<dd><a
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href="http://dev.w3.org/csswg/css3-values/">http://dev.w3.org/csswg/css3-values/</a>
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<dt>Previous version:
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<dd><a
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href="http://www.w3.org/Style/CSS/Tracker/products/33">http://www.w3.org/Style/CSS/Tracker/products/33</a>
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<dt>Feedback:
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@@ -230,7 +239,6 @@ <h2 class="no-num no-toc" id=contents>Table of contents</h2>
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</span> Viewport-percentage lengths: the ‘<code
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class=css>vw</code>’, ‘<code class=css>vh</code>’, ‘<code
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class=css>vmin</code>’, ‘<code class=css>vmax</code>’ units</a>
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</ul>
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<li><a href="#absolute-lengths"><span class=secno>5.2. </span> Absolute
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Expressions: ‘<code class=css>calc()</code>’</a>
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<ul class=toc>
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<li><a href="#calc-syntax"><span class=secno>8.1.1. </span> Syntax</a>
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<li><a href="#calc-type-checking"><span class=secno>8.1.2. </span>
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Type Checking</a>
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<li class=no-num><a href="#conventions"> Document conventions</a>
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<li class=no-num><a href="#conformance-classes"> Conformance classes</a>
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<li class=no-num><a href="#partial"> Partial implementations</a>
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@@ -351,7 +357,6 @@ <h2 id=introduction><span class=secno>1. </span>Introduction</h2>
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used) that can be used by many properties are described in this
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specification, while more specific data types (e.g.,
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<var>&lt;spacing-limit></var>) are described in the corresponding modules.
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<h3 id=placement><span class=secno>1.1. </span> Module Interactions</h3>
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<div class=example>
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<p>For example, here is the value definition for the ‘<code
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class=property>border-collapse</code>’ property:</p>
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class=property>border-collapse</code>’ property:
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<pre>Value: collapse | separate</pre>
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<p>And here is an example of its use:</p>
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<p>And here is an example of its use:
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<pre>table { border-collapse: separate }</pre>
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</div>
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For instance, the following two selectors are exactly the same:
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<div class=example>
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<p style="display:none">Example(s):</p>
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<p style="display:none">Example(s):
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<pre>
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<!-- -->a[title="a not s\
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class=css>url(close%29parens)</code>’) as described in <a href="#URI"
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rel=biblioentry>[URI]<!--{{URI}}--></a>. Alternatively a URL containing
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such characters may be represented as a quoted <a
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href="#strings">string</a> within the ‘<a href="#url"><code
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class=css>url()</code></a>’ notation.
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href="#strings">string</a> within the ‘<code class=css>url()</code>’
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notation.
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<p>In order to create modular style sheets that are not dependent on the
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absolute location of a resource, authors should use relative URIs.
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<pre>body { background: url("tile.png") }</pre>
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<p>is located in a style sheet designated by the URL:</p>
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<p>is located in a style sheet designated by the URL:
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<pre>http://www.example.org/style/basic.css</pre>
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and the required rounding and clamping rules,
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are given in <a href="#required-ranges">Appendix A</a>.
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-->
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<h3 id=integers><span class=secno>4.1. </span> Integers: the ‘<a
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href="#integer-value"><code class=css>&lt;integer></code></a>’ type</h3>
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is used.
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<div class=example>
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<p>The rule:</p>
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<p>The rule:
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<pre>h1 { line-height: 1.2em }</pre>
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<p>means that the font size of <code>h1</code> elements will be 20%
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greater than the computed font size inherited by <code>h1</code>
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elements.</p>
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elements.
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</div>
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<dt><dfn id=ex-unit title=ex>ex unit</dfn>
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<p>When specified on the ‘<code class=property>font-size</code>’
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property of the root element, the ‘<a href="#rem-unit"><code
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class=css>rem</code></a>’ units refer to the property's <em>initial
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value</em>.</p>
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value</em>.
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</dl>
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<h4 id=viewport-relative-lengths><span class=secno>5.1.2. </span>
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<p class=caption>Showing that more device pixels (dots) are needed to
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cover a 1px by 1px area on a high-resolution device than on a low-res one
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</div>
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<h2 id=other-units><span class=secno>6. </span> Other Units</h2>
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<div class=example>
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<p>The following sets the ‘<code class=property>font-size</code>’ so
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that exactly 40em fits within the viewport, ensuring that roughly the
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same amount of text always fills the screen no matter the screen size.</p>
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same amount of text always fills the screen no matter the screen size.
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<pre>
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:root {
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<p>If the rest of the design is specified using the ‘<a
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layout will scale to match the viewport width.</p>
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layout will scale to match the viewport width.
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<div class=example>
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This has notes on how we should handle things when calc() is extended to
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handle unit mult/div. Related to this is <unit>mod<unit>, which can return
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0 and thus introduce computed-time division-by-zero. -->
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<p> Given the complexities of width and height calculations on table cells
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and table elements, math expressions involving percentages for widths and
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<div class=example>
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<p>The following example makes <code>&lt;em></code> elements italic in
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<pre>em { font-style: toggle(italic, normal); }</pre>
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</div>
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<li> the attr() expression's type is valid where the attr() expression is
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<li> if the attribute name is given with a namespace prefix, the prefix is
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defined
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<li> the <var>&lt;fallback></var> is valid where the attr() expression is
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<dd> The attribute value will be parsed as the contents of a CSS <a
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href="#string-value"><var>&lt;string></var></a>. It is interpreted as a
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quoted string within the ‘<a href="#url"><code
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class=css>url()</code></a>’ notation. The default is ‘<code
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class=css>about:invalid</code>’, which is a URI defined (<a
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href="#about-invalid">in Appendix A</a>) to point to a non-existent
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document with a generic error condition. Relative URLs must be made
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absolute according to the rules of the document language as applied to
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URLs originating from the element; they are not relative to the style
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sheet.
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quoted string within the ‘<code class=css>url()</code>’ notation. The
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default is ‘<code class=css>about:invalid</code>’, which is a URI
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defined (<a href="#about-invalid">in Appendix A</a>) to point to a
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non-existent document with a generic error condition. Relative URLs must
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be made absolute according to the rules of the document language as
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applied to URLs originating from the element; they are not relative to
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the style sheet.
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<dt>‘<a href="#integer"><code class=css>integer</code></a>’
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<div class=example>
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<p>This example shows the use of attr() to visually illustrate data in an
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XML file:
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<pre>
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&lt;stock>
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<div class="illegal example">
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<p>All of the following examples are invalid and would cause a parse-time
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error, and thus cause the relevant declaration—in this case all of
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them—to be ignored:
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<pre>
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content: attr(title color); /* 'content' doesn't accept colors */
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<p> The official record of this registration can be found at <a
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<table class="data define">
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<tbody>
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<code>class="example"</code>, like this:
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<div class=example>
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<p>This is an example of an informative example.
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<p>Informative notes begin with the word “Note” and are set apart from
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class=css>attr()</code></a>’.
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<li>Added ‘<a href="#vmax-unit"><code class=css>vmax</code></a>’ unit.
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<p>A <a
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Sheets Level 2 Revision 1 (CSS 2.1) Specification.</cite></a> 7 June
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2011. W3C Recommendation. URL: <a
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href="http://www.w3.org/TR/2011/REC-CSS2-20110607">http://www.w3.org/TR/2011/REC-CSS2-20110607</a>
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</dd>
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<!---->
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<dt id=CSS3-IMAGES>[CSS3-IMAGES]
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Values and Replaced Content Module Level 3.</cite></a> 17 April 2012. W3C
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Candidate Recommendation. (Work in progress.) URL: <a
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href="http://www.w3.org/TR/2012/CR-css3-images-20120417/">http://www.w3.org/TR/2012/CR-css3-images-20120417/</a>
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</dd>
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<dt id=CSS3BG>[CSS3BG]
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Backgrounds and Borders Module Level 3.</cite></a> 24 July 2012. W3C
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Candidate Recommendation. (Work in progress.) URL: <a
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href="http://www.w3.org/TR/2012/CR-css3-background-20120724/">http://www.w3.org/TR/2012/CR-css3-background-20120724/</a>
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</dd>
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<dt id=CSS3COLOR>[CSS3COLOR]
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href="http://www.w3.org/TR/2011/REC-css3-color-20110607"><cite>CSS Color
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Module Level 3.</cite></a> 7 June 2011. W3C Recommendation. URL: <a
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</dd>
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</dd>
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<dt id=CSS3NAMESPACE>[CSS3NAMESPACE]
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Namespaces Module.</cite></a> 29 September 2011. W3C Recommendation. URL:
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<a
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href="http://www.w3.org/TR/2011/REC-css3-namespace-20110929/">http://www.w3.org/TR/2011/REC-css3-namespace-20110929/</a>
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</dd>
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<dt id=RFC2119>[RFC2119]
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words for use in RFCs to Indicate Requirement Levels.</cite></a> Internet
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RFC 2119. URL: <a
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href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
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</dd>
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</dd>
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<dt id=URI>[URI]
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Identifiers (URI): generic syntax.</cite></a> January 2005. Internet RFC
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3986. URL: <a
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href="http://www.ietf.org/rfc/rfc3986.txt">http://www.ietf.org/rfc/rfc3986.txt</a>
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</dd>
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</dd>
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<!---->
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</dl>
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<!--end-normative-->
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module: Cascading and inheritance.</cite></a> 15 December 2005. W3C
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Working Draft. (Work in progress.) URL: <a
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href="http://www.w3.org/TR/2005/WD-css3-cascade-20051215">http://www.w3.org/TR/2005/WD-css3-cascade-20051215</a>
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</dd>
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</dd>
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<dt id=MEDIAQ>[MEDIAQ]
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href="http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/"><cite>Media
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Queries.</cite></a> 19 June 2012. W3C Recommendation. URL: <a
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href="http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/">http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/</a>
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</dd>
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<!---->
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</dl>
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<!--end-informative-->
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title="&lt;time>"><strong>6.2.</strong></a>
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<li>toggle(), <a href="#toggle" title="toggle()"><strong>8.2.</strong></a>
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<li>turn, <a href="#turn" title=turn><strong>6.1.</strong></a>
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‎css3-values/Overview.src.html‎

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<li>
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the attr() expression's type is valid where the attr() expression is placed,
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<li>
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if the attribute name is given with a namespace prefix, the prefix is defined
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<li>
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the <var>&lt;fallback></var> is valid where the attr() expression is placed,
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