1948290 - [wpt-sync] Sync PR 50713 - Don't escape UA shadow trees during selector checking

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 50713 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/50713
Details from upstream follow.

Anders Hartvoll Ruud <[e-mail]> wrote:

Don't escape UA shadow trees during selector checking

CL:6038294 made the assumption that selector matching happening
within shadow trees always has context.tree_scope set, but this
is not the case for UA shadow trees. The rules in the UA stylesheet
can implicitly reach into UA shadows (from the outside), which isn't
normally allowed. Long term, we should find a better way of handling
this (crbug.com/396459461), but for now we just make sure to stay
within the shadow.

Fixed: 396173457
Bug: 396459461
Change-Id: I96cee440600bfe01236a5e4e5f7a8ebf5ee0ad5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6268801
Reviewed-by: Steinar H Gunderson \<[e-mail]>
Commit-Queue: Anders Hartvoll Ruud \<[e-mail]>
Cr-Commit-Position: refs/heads/main@{#1420468}

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=9469192fcbcc6eb135c273d68f1c03fda0a35098

Comment 2

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

CI Results

Ran 7 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 1 tests

Status Summary

Firefox

PASS: 1

Chrome

PASS: 1

Safari

PASS: 1

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/c4a27bf18454
[wpt PR 50713] - Don't escape UA shadow trees during selector checking, a=testonly

Comment 4

[amarc]

https://hg.mozilla.org/mozilla-central/rev/c4a27bf18454