<ident>
The <ident>
CSS data type denotes an arbitrary string used as an identifier.
Syntax
The syntax of <custom-ident>
is similar to CSS identifiers (such as property names), except that it is case-sensitive. It consists of one or more characters, where characters can be any of the following:
- any alphabetical character (
A
toZ
, ora
toz
), - any decimal digit (
0
to9
), - a hyphen (
-
), - an underscore (
_
), - an escaped character (preceded by a backslash,
\
), - a Unicode character (in the format of a backslash,
\
, followed by one to six hexadecimal digits, representing its Unicode code point)
Note that id1
, Id1
, iD1
and ID1
are all different identifiers as they are case-sensitive. On the other hand, as there are several ways to escape a character, toto\?
and toto\3F
are the same identifiers.
Examples
Valid identifiers
nono79 A mix of alphanumeric characters and numbers ground-level A mix of alphanumeric characters and a dash -test A dash followed by alphanumeric characters --toto A custom-property like identifier _internal An underscore followed by alphanumeric characters \22 toto A Unicode character followed by a sequence of alphanumeric characters bili\.bob A correctly escaped period
Invalid identifiers
Specifications
Specification |
---|
CSS Values and Units Module Level 4 # css-identifier |
Browser compatibility
As this type is not a real type but a convenience type used to simplify the definition of other CSS syntax, there is no browser compatibility information as such.