This updated registration obsoletes RFC 2318
<https://datatracker.ietf.org/doc/html/rfc2318>.

Type name: text

Subtype name: css

Required parameters: N/A

Optional parameters: charset (but see below)

Encoding considerations: binary

Security considerations:

CSS is a modular specification and thus, the individual
Security Considerations section of each CSS module in use
should be consulted.

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:

https://www.w3.org/TR/css

Applications that 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 documents.

Fragment identifier considerations: N/A

Additional information:

Deprecated alias names for this type: N/A
Magic number(s): N/A
File extension(s): .css
macOS Uniform Type Identifier(s): public.css
Windows clipboard name(s): N/A

Person & email address to contact for further information:

The W3C CSS Working Group <www-style&w3.org>

Intended usage: COMMON

Restrictions on usage: N/A

Author: The W3C CSS Working Group

Change controller: W3C

Fallback encoding:

For Web compatibility, to determine the character encoding,
user agents follow the CSS Syntax Level 3 specification,
"To determine the fallback encoding of a stylesheet"
https://www.w3.org/TR/css-syntax-3/#determine-the-fallback-encoding

Stylesheet authors should author their stylesheets in UTF-8, and
ensure that either an HTTP header (or equivalent method) declares
the encoding of the stylesheet to be UTF-8, or that the referring
document declares its encoding to be UTF-8.