css-style-attr/Overview.src.html@750d888b5712
css-style-attr/Overview.src.html
Thu, 07 Jan 2010 08:54:32 +0000
- author
- Elika Etemad <fantasai.cvs@inkedblade.net>
- date
- Thu, 07 Jan 2010 08:54:32 +0000
- changeset 1612
- 750d888b5712
- parent 1611
- f7c26d1266f9
- child 1616
- cfd6911cf9c6
- permissions
- -rwxr-xr-x
More precise wording on URL resolution
1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
2 <html lang="en">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
5 <title>CSS Styling Attribute Syntax Level 1</title>
6 <link rel="stylesheet" type="text/css" href="../default.css">
8 <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-ED">
9 </head>
11 <div class="head">
12 <!--logo-->
14 <h1>CSS Styling Attribute Syntax Level 1</h1>
16 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
17 <dl>
18 <dt>This version:</dt>
19 <!-- <dd><dd><a href="http://www.w3.org/TR/[YEAR]/WD-css-style-attr-[CDATE]/">http://www.w3.org/TR/[YEAR]/WD-css-style-attr-[CDATE]/</a></dd> -->
20 <dd><a href="http://dev.w3.org/csswg/css-style-attr/">http://dev.w3.org/csswg/css-style-attr/</a>
21 <dt>Latest version:
22 <dd><a href="http://www.w3.org/TR/css-style-attr">http://www.w3.org/TR/css-style-attr</a>
23 <dt>Previous version:
24 <dd><a href="http://www.w3.org/TR/2002/WD-css-style-attr-20020515">http://www.w3.org/TR/2002/WD-css-style-attr-20020515</a>
25 <dt>Editor:
26 <dd><a href="http://fantasai.inkedblade.net/contact/">Elika J. Etemad</a>
27 <dt>Previous Editors:
28 <dd><span lang="tr">Tantek Çelik</span> (<a href="http://www.microsoft.com/">Microsoft</a>), <<a href="mailto:tantekc@microsoft.com">tantekc@microsoft.com</a>>
29 <dd><a href="http://www.w3.org/People/Bos/">Bert Bos</a> (<a href="http://www.w3.org/">W3C</a>), <<a href="mailto:bert@w3.org">bert@w3.org</a>>
30 <dd>Marc Attinasi (AOL/Netscape), <<a href="mailto:attinasi@netscape.com">attinasi@netscape.com</a>>
31 </dl>
32 <!--begin-copyright-->
33 <p>[Here will be included the file "../copyright.inc"]</p>
34 <!--end-copyright-->
36 <hr title="Separator for header">
37 </div>
39 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
41 <p>Markup languages such as HTML and SVG provide a styling attribute on most
42 elements, to hold a fragment of a style sheet that applies to those elements.
43 One of the possible style sheet languages is CSS. This draft describes the
44 syntax of the CSS fragment that can be used in the styling attribute.
46 <h2 class="no-num no-toc" id="status">Status of this document</h2>
47 <!--status-->
49 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
50 <!--toc-->
52 <h2 id="intro">Introduction</h2>
54 <p>Some document formats have a <dfn>styling attribute</dfn> to permit
55 the author to directly apply style information to specific elements
56 in documents. If a document format defines a styling attribute and the
57 attribute accepts CSS as its value, then this specification defines this
58 <dfn>CSS styling attribute</dfn>'s syntax and interpretation.
60 <div class="example">
61 <p>The following example shows the use of the <code>style</code> attribute
62 in HTML:</p>
63 <pre><p style="<em>color: #090; line-height: 1.2</em>">...</p></pre>
64 </div>
66 <h2 id="conformance">Conformance</h2>
68 <p>A document or implementation cannot conform to CSS Styling Attribute Syntax
69 Level 1 alone, but can claim conformance to CSS Styling Attribute Syntax Level 1
70 if it satisfies the conformance requirements in this specification when
71 implementing CSS together with styling attribute handling as defined in a
72 document language that has CSS styling attributes.</p>
74 <p>Conformance to CSS Styling Attribute Syntax Level 1 is defined for two
75 classes:
76 <dl>
77 <dt><dfn>document</dfn></dt>
78 <dd>A document represented in a document language that defines a styling
79 attribute for one or more of its elements.
80 <dt><dfn>interpreter</dfn></dt>
81 <dd>Someone or something that interprets the semantics of a document and
82 its associated style information.
83 (Most CSS <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">user
84 agents</a> fall under this category.)</dd>
85 </dl>
87 <p>The conformance requirements are expressed with a combination of
88 descriptive assertions and RFC 2119 terminology. The key words "MUST",
89 "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT",
90 "RECOMMENDED", "MAY", and "OPTIONAL" in the normative parts of this
91 document are to be interpreted as described in RFC 2119.
92 However, for readability, these words do not appear in all uppercase
93 letters in this specification. All of the text of this specification is
94 normative except sections explicitly marked as non-normative, examples,
95 and notes. [[!RFC2119]]</p>
97 <p>Examples in this specification are introduced with the words "for example"
98 or are set apart from the normative text with <code>class="example"</code>,
99 like this:
101 <div class="example">
102 <p>This is an example of an informative example.</p>
103 </div>
105 <p>Informative notes begin with the word "Note" and are set apart from the
106 normative text with <code>class="note"</code>, like this:
108 <p class="note">Note, this is an informative note.</p>
110 <h2 id="syntax">Syntax and Parsing</h2>
112 <p>The value of the styling attribute must match the syntax of the contents of
113 a CSS <a href="http://www.w3.org/TR/CSS21/syndata.html#rule-sets">declaration
114 block</a>. The interpreter must parse the styling attribute's value using the
115 same forward-compatible parsing rules that apply to parsing declaration block
116 contents in a normal CSS style sheet. See
117 <a href="http://www.w3.org/TR/CSS21/syndata.html">chapter 4 of the CSS2.1
118 specification</a>. [[!CSS21]]
120 <p class="note">Note that because there is no open brace delimiting the
121 declaration list in the CSS styling attribute syntax, a close brace
122 (<code>}</code>) in the styling attribute's value does not terminate the
123 style data: it is merely an invalid token.</p>
125 <h2 id="grammar">Grammar</h2>
127 <p>The syntax of the CSS fragment that is allowed as the CSS styling
128 attribute's value is formally specified as follows:
130 <pre>
131 inline-stylesheet
132 : S* declaration-list
133 ;
135 declaration-list
136 : declaration [ ';' S* declaration ]*
137 ;
138 </pre>
140 <p>Please refer to the grammar in <a href="http://www.w3.org/TR/CSS21/grammar.html">appendix D
141 of the CSS2.1 specification</a> [[!CSS21]] for the definition of the symbols
142 not defined here.
144 <h2 id="interpret">Cascading and Interpretation</h2>
146 <p>The declarations in a styling attribute apply to the element to which
147 the attribute belongs. CSS2.1 <a href="/TR/CSS21/cascade.html#specificity">defines</a>
148 how style sheets and styling attributes are cascaded together. [[!CSS21]]
149 Relative URLs in the style data must be resolved relative to the styling
150 attribute's element (or to the document if per-element resolution is not
151 defined) when the attribute's value is parsed<!-- so dynamic changes to
152 the base URL don't affect the CSS ~Hixie -->.
154 <p>Aside from the differences in cascading, the declarations in a styling
155 attribute must be interpreted exactly as if they were given in a CSS
156 style rule that applies to the element.
158 <p>The CSS Working Group strongly recommends that document languages do
159 not allow multiple CSS styling attributes on a single element. If a document
160 language allows multiple CSS styling attributes, each must be parsed
161 independently and treated as a separate style rule, the ordering of which
162 should be defined by the document language, else is undefined.
164 <h2 id="ack">Acknowledgments</h2>
166 <p>Thanks to feedback from Daniel Glazman, Ian Hickson, Eric A. Meyer,
167 Björn Höhrmann.
169 <h2 id="references">References
171 <h3 class="no-num" id="normative-references">Normative references</h3>
173 <!--begin-normative-->
174 <p>[Here will be inserted the file "normative.inc"]</p>
175 <!--end-normative-->
177 <h3 class="no-num" id="informative-references">Informative references</h3>
179 <!--begin-informative-->
180 <p>[Here will be inserted the file "informative.inc"]</p>
181 <!--end-informative-->
183 </body>
184 </html>
185 <!-- Keep this comment at the end of the file
186 Local variables:
187 mode: sgml
188 sgml-declaration:"~/SGML/HTML4.decl"
189 sgml-default-doctype-name:"html"
190 sgml-minimize-attributes:t
191 sgml-nofill-elements:("pre" "style" "br")
192 End:
193 -->
