WPT coverage for Pointer Events for slotted elements.
This CL adds tests for two untested aspects of PointerEvents in slots:
- PE event sequence around slots when the shadow DOM remains unchanged.
- Boundary events after modifications to slotted elements.
This covers the last remaining WPT for:
w3c/pointerevents#477
Bug: 40156858
Change-Id: I9823595a0b15672d0395d4e117ccc6462c3e42f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5598510
Commit-Queue: Mustaq Ahmed mustaq@chromium.org
Reviewed-by: Robert Flack flackr@chromium.org
Cr-Commit-Position: refs/heads/main@{#1313570}