Sergey Biryukov cb6f447d52 KSES: Allow min(), max(), minmax(), and clamp() values to be used in inline CSS.
Additionally, this commit updates `safecss_filter_attr()` to add support for nested `var()` functions, so that a fallback value can be another CSS variable.

Follow-up to [50923].

Props johnregan3, noisysocks, cbravobernal, uxl, isabel_brison, andrewserong, ramonopoly, joyously, bernhard-reiter, peterwilsoncc.
Fixes #55966.

git-svn-id: https://develop.svn.wordpress.org/trunk@54100 602fd350-edb4-49c9-b593-d223f7449a82
2022-09-08 13:24:10 +00:00
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