tree d4739196ae479a0d022daac56511e68f1e16cf53
parent c52a96ce1d09ad2e90c710a2ee1d63aba089586c
author leviw <leviw@chromium.org> 1455661897 -0800
committer Commit bot <commit-bot@chromium.org> 1455661974 +0000

Implement Style Containment

The only CSS feature we support that is bound by style containment is
counters. This patch adds the concept of an enclosing style containment
ancestor to the tree walking logic in LayoutCounter and avoids crossing
these boundaries when matching counters.

Layout Containment description from spec:
https://drafts.csswg.org/css-containment/#containment-style

Intent to implement:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/9W80Kw-z3ss
BUG=561713

Review URL: https://codereview.chromium.org/1519123003

Cr-Commit-Position: refs/heads/master@{#375684}