web-platform-tests/wpt merge_pr_48910

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Add more customizable- appearance oscillation tests Changing the appearance value while the picker is open causes issues, so be sure any changes to appearance close the picker. This adds further tests that switch appearance via CSS, to ensure there aren't cycles in style code. The tests all currently fail. Code needs to be added to close the picker when the appearance value changes on either the base control or the picker while the picker is open. There also seem to be invalidation bugs, e.g. this error picker should open when clicked expected true got false indicates that even though the appearance value is correct in one of the tests, the select cannot be opened. It appears that some of the linked crash bugs may no longer get hit. Bug: 40146374,376097114,364924715,364924718 Change-Id: I1a4a0d342ee724f97755ceb49e855becaee40bab Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5973354 Auto-Submit: Mason Freed masonf@chromium.org Commit-Queue: Joey Arhar jarhar@chromium.org Reviewed-by: Joey Arhar jarhar@chromium.org Cr-Commit-Position: refs/heads/main@{#1376283}