RFC2318 - The text/css Media Type

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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:

(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, resulting

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.

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: 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.org

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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