There are various manual checks being done across the codebase, that are essentially `isCSSWideKeyword`. `isCSSWideKeyword` should be used instead so those manual checks aren't duplicate code, and don't fall out of date in case a new keyword is introduced.
<rdar://problem/76900720>
Hmm, this would require moving `isCSSWideKeyword` to a header file that's convenient to include.
See https://webkit-search.igalia.com/webkit/search?q=CSSValueInitial&path=&case=false®exp=false