css-style-attr/Overview.src.html@15de3a6645bc
css-style-attr/Overview.src.html
Tue, 19 Jan 2010 18:02:25 +0000
- author
- Elika Etemad <fantasai.cvs@inkedblade.net>
- date
- Tue, 19 Jan 2010 18:02:25 +0000
- changeset 1621
- 15de3a6645bc
- parent 1620
- 3a18ef00b9b9
- child 1624
- 1fa22f8caa3d
- permissions
- -rwxr-xr-x
fix link to fantasai's contact info, add domain for w3.org spec link
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 Attributes 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 Attributes 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-->
48 <p>This specification is a <strong>Last Call Working Draft</strong>. All
49 persons are encouraged to review this document and <strong>send comments
50 to the <a
51 href="http://lists.w3.org/Archives/Public/www-style/">www-style</a>
52 mailing list</strong> as described above. The <strong>deadline for
53 comments</strong> is <strong>9 February 2010</strong>.
55 <p>A CSS Styling Attribute <a href="http://www.w3.org/Style/CSS/Test/">Test
56 Suite</a> will be developed during the Candidate Recommendation phase of
57 this CSS Styling Attribute specification.
59 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
60 <!--toc-->
62 <h2 id="intro">Introduction</h2>
64 <p>Some document formats have a <dfn>styling attribute</dfn> to permit
65 the author to directly apply style information to specific elements
66 in documents. If a document format defines a styling attribute and the
67 attribute accepts CSS as its value, then this specification defines this
68 <dfn>CSS styling attribute</dfn>’s syntax and interpretation.
70 <div class="example">
71 <p>The following example shows the use of the <code>style</code> attribute
72 in HTML:</p>
73 <pre><p style="<em>color: #090; line-height: 1.2</em>">...</p></pre>
74 </div>
76 <h2 id="conformance">Conformance</h2>
78 <p>A document or implementation cannot conform to CSS Styling Attributes
79 Level 1 alone, but can claim conformance to CSS Styling Attributes Level 1
80 if it satisfies the conformance requirements in this specification when
81 implementing CSS together with styling attribute handling as defined in a
82 document language that has CSS styling attributes.</p>
84 <p>Conformance to CSS Styling Attributes Level 1 is defined for two
85 classes:
86 <dl>
87 <dt><dfn>document</dfn></dt>
88 <dd>A document represented in a document language that defines a styling
89 attribute for one or more of its elements.
90 <dt><dfn>interpreter</dfn></dt>
91 <dd>Someone or something that interprets the semantics of a document and
92 its associated style information.
93 (Most CSS <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">user
94 agents</a> fall under this category.)</dd>
95 </dl>
97 <p>The conformance requirements are expressed with a combination of
98 descriptive assertions and RFC 2119 terminology. The key words "MUST",
99 "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT",
100 "RECOMMENDED", "MAY", and "OPTIONAL" in the normative parts of this
101 document are to be interpreted as described in RFC 2119.
102 However, for readability, these words do not appear in all uppercase
103 letters in this specification. All of the text of this specification is
104 normative except sections explicitly marked as non-normative, examples,
105 and notes. [[!RFC2119]]</p>
107 <p>Examples in this specification are introduced with the words "for example"
108 or are set apart from the normative text with <code>class="example"</code>,
109 like this:
111 <div class="example">
112 <p>This is an example of an informative example.</p>
113 </div>
115 <p>Informative notes begin with the word "Note" and are set apart from the
116 normative text with <code>class="note"</code>, like this:
118 <p class="note">Note, this is an informative note.</p>
120 <h2 id="syntax">Syntax and Parsing</h2>
122 <p>The value of the styling attribute must match the syntax of the contents of
123 a CSS <a href="http://www.w3.org/TR/CSS21/syndata.html#rule-sets">declaration
124 block</a>, whose formal grammar is given below in terms of the
125 <a href="http://www.w3.org/TR/CSS21/syndata.html#syntax">CSS core grammar</a>:
127 <pre>
128 declaration-list
129 : S* declaration? [ ';' S* declaration? ]*
130 ;
131 </pre>
133 <p class="note">Note that following the CSS2.1 convention, comment tokens
134 are not shown in the rule above.
136 <p>The interpreter must parse the styling attribute's value using the
137 same forward-compatible parsing rules that apply to parsing declaration block
138 contents in a normal CSS style sheet. See
139 <a href="http://www.w3.org/TR/CSS21/syndata.html">chapter 4 of the CSS2.1
140 specification</a> for details. [[!CSS21]]
142 <p class="note">Note that because there is no open brace delimiting the
143 declaration list in the CSS styling attribute syntax, a close brace
144 (<code>}</code>) in the styling attribute's value does not terminate the
145 style data: it is merely an invalid token.</p>
147 <h2 id="interpret">Cascading and Interpretation</h2>
149 <p>The declarations in a styling attribute apply to the element to which
150 the attribute belongs. CSS2.1 <a href="http://www.w3.org/TR/CSS21/cascade.html#specificity">defines</a>
151 how style sheets and styling attributes are cascaded together. [[!CSS21]]
152 Relative URLs in the style data must be resolved relative to the styling
153 attribute's element (or to the document if per-element resolution is not
154 defined) when the attribute's value is parsed<!-- so dynamic changes to
155 the base URL don't affect the CSS ~Hixie -->.
157 <p>Aside from the differences in cascading, the declarations in a styling
158 attribute must be interpreted exactly as if they were given in a CSS
159 style rule that applies to the element.
161 <p>The CSS Working Group strongly recommends that document languages do
162 not allow multiple CSS styling attributes on a single element. If a document
163 language allows multiple CSS styling attributes, each must be parsed
164 independently and treated as a separate style rule, the ordering of which
165 should be defined by the document language, else is undefined.
167 <h2 id="ack">Acknowledgments</h2>
169 <p>Thanks to feedback from Daniel Glazman, Ian Hickson, Eric A. Meyer,
170 Björn Höhrmann.
172 <h2 id="references">References
174 <h3 class="no-num" id="normative-references">Normative references</h3>
176 <!--begin-normative-->
177 <p>[Here will be inserted the file "normative.inc"]</p>
178 <!--end-normative-->
180 <h3 class="no-num" id="informative-references">Informative references</h3>
182 <!--begin-informative-->
183 <p>[Here will be inserted the file "informative.inc"]</p>
184 <!--end-informative-->
186 </body>
187 </html>
188 <!-- Keep this comment at the end of the file
189 Local variables:
190 mode: sgml
191 sgml-declaration:"~/SGML/HTML4.decl"
192 sgml-default-doctype-name:"html"
193 sgml-minimize-attributes:t
194 sgml-nofill-elements:("pre" "style" "br")
195 End:
196 -->
