Sync web-platform-tests PR 24351 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/24351
Details from upstream follow.

Mike Pennisi <mike@mikepennisi.com> wrote:

[html] Improve coverage for COOP

CI Results

Ran 12 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 1 tests and 4 subtests

Status Summary

Firefox

OK : 1
PASS: 4

Chrome

OK : 1
PASS: 4

Safari

OK : 1
FAIL: 4

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

Details

New Tests That Don't Pass

/html/cross-origin-opener-policy/coop-sandbox.https.html: OK [Gecko-linux1804-64-debug, Gecko-linux1804-64-opt, Gecko-linux1804-64-qr-debug, Gecko-linux1804-64-qr-opt, Gecko-windows10-64-debug, Gecko-windows10-64-opt, Gecko-windows10-64-qr-debug, Gecko-windows10-64-qr-opt, Gecko-windows7-32-debug, Gecko-windows7-32-opt, GitHub], SKIP [Gecko-android-em-7.0-x86_64-debug-geckoview, Gecko-android-em-7.0-x86_64-opt-geckoview] (Chrome: OK, Safari: OK)

Tests Disabled in Gecko Infrastructure

/html/cross-origin-opener-policy/coop-sandbox.https.html: OK [Gecko-linux1804-64-debug, Gecko-linux1804-64-opt, Gecko-linux1804-64-qr-debug, Gecko-linux1804-64-qr-opt, Gecko-windows10-64-debug, Gecko-windows10-64-opt, Gecko-windows10-64-qr-debug, Gecko-windows10-64-qr-opt, Gecko-windows7-32-debug, Gecko-windows7-32-opt, GitHub], SKIP [Gecko-android-em-7.0-x86_64-debug-geckoview, Gecko-android-em-7.0-x86_64-opt-geckoview] (Chrome: OK, Safari: OK)

https://hg.mozilla.org/mozilla-central/rev/99889e08907f