[css-values] unify CSS wide keywords and defaulting keywords #7170
Description
These keyword definitions are currently scattered throughout the specification, making it easy for other CSS parsers or engine implementers to miss them. e.g.
var wideKeywords = map[string]bool{
"initial": true,
"inherit": true,
"unset": true,
}match &*value.to_ascii_lowercase() {
"initial" | "inherit" | "unset" | "revert" | "default" => {
return Err(Error::new(span, ErrorKind::InvalidCustomIdent(raw)));
}
_ => {}
}const globalKeywords = ['inherit', 'initial', 'unset'];css-values-4
https://www.w3.org/TR/css-values-4/#common-keywords
Defined:
initialinheritunset
css-cascade-4
https://drafts.csswg.org/css-cascade/#defaulting-keywords
Defined:
initialinheritunsetrevert
css-cascade-5
https://drafts.csswg.org/css-cascade-5/#revert-layer
Defined:
initialinheritunsetrevertrevert-layer
css-values-4
https://www.w3.org/TR/css-values-4/#ref-for-css-wide-keywords
The CSS-wide keywords are not valid
<custom-ident>s. Thedefaultkeyword is reserved and is also not a valid<custom-ident>
There is a default keyword.