Add ::check pseudo element parsing support
Defined in:
w3c/csswg-drafts#10986
Bug: 369319576
Change-Id: I90fb6ef81fd5941709fae6936c7474339a7715e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5928423
Reviewed-by: Rune Lillesveen futhark@chromium.org
Reviewed-by: Joey Arhar jarhar@chromium.org
Commit-Queue: Traian Captan tcaptan@chromium.org
Cr-Commit-Position: refs/heads/main@{#1369011}