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Network Working Group                                             H. LieRequest for Comments: 2318                                        B. BosCategory: Informational                                        C. Lilley                                                                     W3C                                                              March 1998The text/css Media TypeStatus 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:Lie, et. al.                 Informational                      [Page 1]

RFC 2318                  text/css Media Type                 March 1998   (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: ietf-types@iana.org       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, resultingLie, et. al.                 Informational                      [Page 2]

RFC 2318                  text/css Media Type                 March 1998       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",RFC2068, 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.Lie, et. al.                 Informational                      [Page 3]

RFC 2318                  text/css Media Type                 March 19986.  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: howcome@w3.org   Bert Bos   2004, route des Lucioles - B.P. 93   06902 Sophia Antipolis Cedex   FRANCE   Phone: +33 (0)492387692   Fax:   +33 (0)493657765   EMail: bert@w3.org   Chris Lilley   2004, route des Lucioles - B.P. 93   06902 Sophia Antipolis Cedex   FRANCE   Phone: +33 (0)492387987   Fax:   +33 (0)493657765   EMail: chris@w3.orgLie, et. al.                 Informational                      [Page 4]

RFC 2318                  text/css Media Type                 March 19987.  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."Lie, et. al.                 Informational                      [Page 5]