The value can be any hexadecimal number, specified according to the sRGB color space, or one of sixteen color names. These attribute values are integers that represent a number of pixels. In allotting space, a browser first allots pixel and percentage lengths, then divides the remaining space among all elements with a relative length. A MultiLengths value is a comma-separated list of MultiLength values. Values of type ContentType give a single content type while values of type ContentTypes give a comma-separated list of content types.
Content types are case-insensitive.
Many common content types are registered at the IANA . LanguageCode Attribute values of type LanguageCode specify a language code according to RFC 1766 . Examples of language codes include en for English, en-US for American English, and ja for Japanese. Whitespace is not allowed in the language code, which is case-insensitive. These attribute values specify character encodings of linked resources.