Network Working Group                                             H. Lie
Request for Comments: 2318                                        B. Bos
Category: Informational                                        C. Lilley
                                                                    W3C
                                                             March 1998


                       The text/css Media Type

Status of this Memo

  This memo provides information for the Internet community.  It does
  not specify an Internet standard of any kind.  Distribution of this
  memo is unlimited.

Copyright Notice

  Copyright (C) The Internet Society (1998).  All Rights Reserved.

Abstract

  Cascading Style Sheets (CSS) is a style sheet language for the World
  Wide Web. CSS style sheets have been in use since October 1995 using
  the Media Type text/css without registration; this memo seeks to
  regularize that position.

1.  Introduction

  The World Wide Web Consortium has issued a Recommendation [1], which
  defines Cascading Style Sheets, level 1. This memo provides
  information about the text/css Media Type.

2.  Cascading Style Sheets

  Cascading Style Sheets (CSS) is a style sheet language for the World
  Wide Web. It describes the presentation (e.g. fonts, colors and
  spacing) of structured documents. CSS is human readable and writable,
  and expresses style in common desktop publishing terminology.

  CSS style sheets have been in use since October 1995 using the Media
  Type text/css without registration; this memo seeks to regularize
  that position.

  A CSS style sheet can be either:







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  (1) external - the style sheet is linked to a document through a
      URI and exists as a separate object on the Web. The media type
      text/css is used when fetching the object, for example in the
      Content-Type and Accept header fields of HTTP [2].

  (2) internal - the style sheet is contained within the document. A
      typical scenario is an HTML [3] document that contains a style
      sheet within the STYLE element. Due to this close relationship,
      HTML and CSS share the same top-level name ("text").

4.  Registration Information

      To: [email protected]
      Subject: Registration of MIME media type text/css

      MIME media type name: text

      MIME subtype name: css

      Required parameters: none

      Optional parameters: charset

      The syntax of CSS is expressed in US-ASCII, but a CSS file can
      contain strings which may use any Unicode character. Any charset
      that is a superset of US-ASCII may be used; US-ASCII, iso-8859-X
      and utf-8 are recommended.

  Encoding considerations:

      For use with transports that are not 8-bit clean, quoted-
      printable encoding is recommended since the majority of
      characters will be CSS syntax and thus US-ASCII

  Security considerations:

      Applying a style sheet to a document may hide information
      otherwise visible. For example, a very small font size may be
      specified, or the display of certain document elements may be
      turned off.

      CSS style sheets consist of declarative property/value pairs
      assigned to element selectors. They contain no executable code.

      As with HTML documents, CSS style sheets may contain links to
      other media (images, sounds, fonts, other style sheets) and those
      links are typically followed automatically by software, resulting




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      in the transfer of files without the explicit request of the user
      for each one. The security considerations of each linked file are
      those of the individual registered types.

  Interoperability considerations:

      CSS has proven to be widely interoperable across computer
      platforms, across Web browsers of different makes, and for import
      and export in multiple authoring tools.

  Published specification: see [1]

  Applications which use this media type:

      CSS is device-, platform- and vendor-neutral and is supported by
      a wide range of Web user agents and authoring tools for
      formatting HTML and XML documents.

  Additional information:

      Magic number(s): none
      File extension(s): .css
      Macintosh File Type Code(s): "css "
      Object Identifier(s) or OID(s): none

  Person & email address to contact for further information:

      The authors of this memo.

  Intended usage: COMMON

    Author/Change controller:

5.  References

  [1]  Lie, H., and B. Bos, "Cascading Style Sheets, level 1",
       W3C Recommendation REC-CSS1-961217, http://www.w3.org/TR/REC-
       CSS1-961217, December 1996.

  [2]  Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.
       Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC
       2068, January 1997.

  [3]  Raggett, D., Le Hors, A. and I. Jacobs, "HTML 4.0
       Specification", W3C Recommendation REC-html40-971218,
       http://www.w3.org/TR/REC-html40, December 1997.





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6.  Authors' Addresses

  Hakon Lie
  W3C/INRIA
  2004, route des Lucioles - B.P. 93
  06902 Sophia Antipolis Cedex
  FRANCE

  Phone: +33 (0)492387771
  Fax:   +33 (0)493657765
  EMail: [email protected]


  Bert Bos
  2004, route des Lucioles - B.P. 93
  06902 Sophia Antipolis Cedex
  FRANCE

  Phone: +33 (0)492387692
  Fax:   +33 (0)493657765
  EMail: [email protected]


  Chris Lilley
  2004, route des Lucioles - B.P. 93
  06902 Sophia Antipolis Cedex
  FRANCE

  Phone: +33 (0)492387987
  Fax:   +33 (0)493657765
  EMail: [email protected]




















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7.  Full Copyright Statement

  Copyright (C) The Internet Society (1998).  All Rights Reserved.

  This document and translations of it may be copied and furnished to
  others, and derivative works that comment on or otherwise explain it
  or assist in its implmentation may be prepared, copied, published and
  distributed, in whole or in part, without restriction of any kind,
  provided that the above copyright notice and this paragraph are
  included on all such copies and derivative works.  However, this
  document itself may not be modified in any way, such as by removing
  the copyright notice or references to the Internet Society or other
  Internet organizations, except as needed for the purpose of
  developing Internet standards in which case the procedures for
  copyrights defined in the Internet Standards process must be
  followed, or as required to translate it into languages other than
  English.

  The limited permissions granted above are perpetual and will not be
  revoked by the Internet Society or its successors or assigns.

  This document and the information contained herein is provided on an
  "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
  TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
  BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
  HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."
























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