Bug 1854180 [wpt PR 42006] - Implement setSequentialFocusStartingPoin…

…t, a=testonly

Automatic update from web-platform-tests
Implement setSequentialFocusStartingPoint

This is proposed here: whatwg/html#5326

Change-Id: I2c0c0ac578180ce5e1cf327fb65c6450a7d49f60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4866726
Reviewed-by: Di Zhang <dizhanggchromium.org>
Commit-Queue: Joey Arhar <jarharchromium.org>
Cr-Commit-Position: refs/heads/main{#1197956}

--

wpt-commits: ac2aa5a07011181a9437a071786ded31431b6b73
wpt-pr: 42006

UltraBlame original commit: e31a9e86898a1b6b91b3acb6c3b792ba4d67166f

testing/web-platform/tests/html/interaction/focus/setSequentialFocusStartingPoint.tentative.html

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