CSS: WPT for style update on sibling insertion

https: //drafts.csswg.org/selectors-4/#adjacent-sibling-combinators
https: //drafts.csswg.org/selectors-4/#general-sibling-combinators
Change-Id: I79b93fc952a09de6eff69d312b5e3ceadef1e7ea
Reviewed-on: https://chromium-review.googlesource.com/c/1420555
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624541}
4 files changed