GitLab

LGTMs to ship:
https://groups.google.com/a/chromium.org/g/blink-dev/c/JdAQ6HNoZvk/m/B1aMS33oAAAJ

whatwg/html spec: https://github.com/whatwg/html/pull/4293

Bug: 539938
Change-Id: Ib875fe971ff8ab93ed733f6a0c1d4dd3ee5c7489
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095602Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750209}