commit 802978abb19b4567b150b18d7580981d1f95ce72
author Oriol Brufau <obrufau@igalia.com> Fri Oct 25 07:32:15 2019
committer Commit Bot <commit-bot@chromium.org> Fri Oct 25 07:32:15 2019
tree 3f9e528d01662812f90e5613937769e1cf4eb96e
parent b3a546fe11653ecb3007e5d39cb51dc8cec8305a

[css-pseudo] Implement parsing for ::marker pseudo-element

Parse ::marker as a valid pseudo-element, behind an experimental flag.
The actual logic of ::marker will be implemented in follow-up patches.

Intent to Implement:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/8v7pouXxxAc

Spec: https://drafts.csswg.org/css-pseudo-4/#marker-pseudo

Bug: 457718

TEST=external/wpt/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html
TEST=external/wpt/css/css-scoping/slotted-parsing.html

Change-Id: Ia4014afdbf5d0f2a642f349641140b03dfceee22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876407
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709390}