Los lenguajes de marcas como HTML y SVG proporcionan un atributo de estilo en la mayoría de los elementos, para contener la información de estilo en línea que se aplica a esos elementos. Este proyecto describe la sintaxis e interpretación del fragmento de CSS que se puede utilizar en este tipo de atributos de estilo.W3

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24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 1/7CSS Style AttributesW3C Recommendation 07 November 2013http://www.w3.org/TR/2013/REC-css-style-attr-20131107/http://www.w3.org/TR/css-style-attrhttp://dev.w3.org/csswg/css-style-attr/ (change log)http://www.w3.org/TR/2013/PR-css-style-attr-20131003/www-style@w3.org with subject line “[css-style-attr] … message topic …”(archives)Tantek Çelik (Mozilla, and formerly at Microsoft Corporation)<tantek@cs.stanford.edu>Elika J. Etemad (Mozilla)Bert Bos (W3C), <bert@w3.org>Marc Attinasi (AOL/Netscape), <attinasi@netscape.com>http://test.csswg.org/suites/css-style-attr/nightly-unstable/Please refer to the errata for this document, which may include some normativecorrections.See also translations.Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C liability, trademarkand document use rules apply.This version:Latest version:Editor's draft:Previous version:Feedback:Editors:Previous Editors:Test suite:24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 2/7AbstractMarkup languages such as HTML [HTML401] and SVG [SVG11] provide a styleattribute on most elements, to hold inline style information that applies to thoseelements. This draft describes the syntax and interpretation of the CSS fragment thatcan be used in such style attributes.Status of this documentThis section describes the status of this document at the time of its publication. Otherdocuments may supersede this document. A list of current W3C publications and thelatest revision of this technical report can be found in the W3C technical reportsindex at http://www.w3.org/TR/.This document has been reviewed by W3C Members, by software developers, andby other W3C groups and interested parties, and is endorsed by the Director as aW3C Recommendation. It is a stable document and may be used as referencematerial or cited from another document. W3C's role in making theRecommendation is to draw attention to the specification and to promote itswidespread deployment. This enhances the functionality and interoperability of theWeb.Please see the Working Group's implementation report. One test is not passed,although this is due to bugs in browser implementation of xml:base and attribute(non)ordering, not the style attribute itself. The equivalent test for HTML (including thexml serialisation of HTML5) is passed by multiple implementations.No changes to this document have been made since the previous version.The (archived) public mailing list www-style@w3.org (see instructions) is preferredfor discussion of this specification. When sending e-mail, please put the text “css-style-attr” in the subject, preferably like this: “[css-style-attr] …summary ofcomment…”This document was produced by the CSS Working Group (part of the Style Activity).This document was produced by a group operating under the 5 February 2004 W3CPatent Policy. W3C maintains a public list of any patent disclosures made inconnection with the deliverables of the group; that page also includes instructions for24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 3/7disclosing a patent. An individual who has actual knowledge of a patent which theindividual believes contains Essential Claim(s) must disclose the information inaccordance with section 6 of the W3C Patent Policy.Table of Contents1. IntroductionSome document formats have a style attribute to permit the author to directly applystyle information to specific elements in documents. If a document format defines astyle attribute (whether named ‘style’ or something else) and the attribute acceptsCSS as its value, then this specification defines that style attribute’s syntax andinterpretation.1. Introduction2. Conformance3. Syntax and Parsing4. Cascading and Interpretation5. Acknowledgments6. ReferencesNormative referencesInformative referencesEXAMPLE 1The following example shows the use of the style attribute in HTML [HTML401]:<p style="color: #090; line-height: 1.2">...</p>24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 4/72. ConformanceA document or implementation cannot conform to CSS Style Attributes alone, butcan claim conformance to CSS Style Attributes if it satisfies the conformancerequirements in this specification when implementing CSS together with styleattribute handling as defined in a document language that has one or more CSSstyle attributes.Conformance to CSS Style Attributes is defined for two classes:A document represented in a document language that defines a style attributefor one or more of its elements.Someone or something that interprets the semantics of a document and itsassociated style information. (Most CSS user agents fall under this category.)The conformance requirements are expressed with a combination of descriptiveassertions 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 thisdocument are to be interpreted as described in RFC 2119. However, for readability,these words do not appear in all uppercase letters in this specification. All of the textof this specification is normative except sections explicitly marked as non-normative,examples, and notes. [RFC2119]Examples in this specification are introduced with the words "for example" or are setapart from the normative text with class="example", like this:Informative notes begin with the word "Note" and are set apart from the normativetext with class="note", like this:documentinterpreterEXAMPLE 2This is an example of an informative example.Note, this is an informative note.24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 5/73. Syntax and ParsingThe value of the style attribute must match the syntax of the contents of a CSSdeclaration block (excluding the delimiting braces), whose formal grammar is givenbelow in the terms and conventions of the CSS core grammar:declaration-list  : S* declaration? [ ';' S* declaration? ]*  ;The interpreter must parse the style attribute's value using the same forward-compatible parsing rules that apply to parsing declaration block contents in a normalCSS style sheet. See chapter 4 of the CSS2.1 specification for details. [CSS21]4. Cascading and InterpretationThe declarations in a style attribute apply to the element to which the attributebelongs. In the cascade, these declarations are considered to have author origin anda specificity higher than any selector. CSS2.1 defines how style sheets and styleattributes are cascaded together. [CSS21] Relative URLs in the style data must beresolved relative to the style attribute's element (or to the document if per-elementresolution is not defined) when the attribute's value is parsed.Aside from the differences in cascading, the declarations in a style attribute must beinterpreted exactly as if they were given in a CSS style rule that applies to theelement.The CSS Working Group strongly recommends that document languages do notNote that following the CSS2.1 convention, comment tokens are not shown in therule above.Note that because there is no open brace delimiting the declaration list in theCSS style attribute syntax, a close brace (}) in the style attribute's value does notterminate the style data: it is merely an invalid token.24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 6/7allow multiple CSS style attributes on a single element. If a document languageallows multiple CSS style attributes, each must be parsed independently and treatedas a separate style rule, the ordering of which should be defined by the documentlanguage, else is undefined.5. AcknowledgmentsThanks to feedback from Daniel Glazman, Ian Hickson, Eric A. Meyer, BjörnHöhrmann.6. ReferencesNormative referencesBert Bos; et al. Cascading Style Sheets Level 2 Revision 1 (CSS 2.1)Specification. 7 June 2011. W3C Recommendation. URL:http://www.w3.org/TR/2011/REC-CSS2-20110607S. Bradner. Key words for use in RFCs to Indicate Requirement Levels.Internet RFC 2119. URL: http://www.ietf.org/rfc/rfc2119.txtInformative referencesDave Raggett; Arnaud Le Hors; Ian Jacobs. HTML 4.01 Specification. 24December 1999. W3C Recommendation. URL:http://www.w3.org/TR/1999/REC-html401-19991224Erik Dahlström; et al. Scalable Vector Graphics (SVG) 1.1 (Second Edition).16 August 2011. W3C Recommendation. URL:http://www.w3.org/TR/2011/REC-SVG11-20110816/[CSS21][RFC2119][HTML401][SVG11]24/3/2014 CSS Style Attributeshttp://www.w3.org/TR/css-style-attr/ 7/7

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