ident
Draft: This page is not complete.
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
34rem It must not start with a decimal digit. -12rad It must not start with a dash followed by a decimal digit. bili.bob Only alphanumeric characters, _, and - needn't be escaped. 'bilibob' This would be a <string>. "bilibob" This would be a <string>.
Specifications
Specification | Status | Comment |
---|---|---|
CSS Values and Units Module Level 4 The definition of ' <ident> ' in that specification. | Editor's Draft | |
CSS Values and Units Module Level 3 The definition of ' <ident> ' in that specification. | Candidate Recommendation |
Browser compatibility
See also
-
<custom-ident>
– A restricted subset of<ident>
values excluding CSS-wide keywords,custom properties
and other per-property values.
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https://developer.mozilla.org/en-US/docs/Web/CSS/ident