Sync web-platform-tests PR 38995 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/38995
Details from upstream follow.

Fredrik Söderquist <fs@opera.com> wrote:

Fix html/semantics/embedded-content/the-video-element/intrinsic_sizes.htm

Reading .width/.height on the computed style returns the used value, and
thus it will flush any pending layout changes. This means that the
assertions that attempted to assert the "before" state were incorrect.
Remove them.

Bug: 1234202
Change-Id: Ib24d65ecf353d3cb3acf50e4c0d35ee729d827df
Reviewed-on: https://chromium-review.googlesource.com/4337505
WPT-Export-Revision: 8b1fc9c29eb28ca3f2f1103078fb7b9482fd1e10

CI Results

Ran 0 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 1 tests and 5 subtests

Status Summary

Firefox

OK : 1
PASS: 3
FAIL: 2

Chrome

OK : 1
PASS: 5

Safari

OK : 1
PASS: 4
FAIL: 1

Links

GitHub PR Head
GitHub PR Base

Details

Firefox-only Failures

• /html/semantics/embedded-content/the-video-element/intrinsic_sizes.htm [wpt.fyi]
  • default object size after poster is removed: FAIL

New Tests That Don't Pass

• /html/semantics/embedded-content/the-video-element/intrinsic_sizes.htm [wpt.fyi]
  • default object size after src is removed: FAIL (Chrome: PASS, Safari: FAIL)
  • default object size after poster is removed: FAIL (Chrome: PASS, Safari: PASS)

https://hg.mozilla.org/mozilla-central/rev/ae8e9e313e83