Sync web-platform-tests PR 25033 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/25033
Details from upstream follow.

Andrea Giammarchi <andrea.giammarchi@gmail.com> wrote:

Issue #5552 - Verify a defined class is resolved whenDefined

As mentioned in this comment, this PR provides a basic asynchronous test to verify the defined class is resolved.

CI Results

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

Total 1 tests and 46 subtests

Status Summary

Firefox

OK : 1
PASS: 35
FAIL: 11

Chrome

OK : 1
PASS: 41
FAIL: 5

Safari

OK : 1
PASS: 31
FAIL: 15

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

Details

Firefox-only Failures

/custom-elements/CustomElementRegistry.html
customElements.define must get callbacks of the constructor prototype: FAIL
customElements.define must rethrow an exception thrown while getting callbacks on the constructor prototype: FAIL
customElements.define must rethrow an exception thrown while converting a callback value to Function callback type: FAIL

New Tests That Don't Pass

/custom-elements/CustomElementRegistry.html
customElements.define must get callbacks of the constructor prototype: FAIL (Chrome: PASS, Safari: PASS)
customElements.define must rethrow an exception thrown while getting callbacks on the constructor prototype: FAIL (Chrome: PASS, Safari: PASS)
customElements.define must rethrow an exception thrown while converting a callback value to Function callback type: FAIL (Chrome: PASS, Safari: PASS)
customElements.define must get "observedAttributes" property on the constructor prototype when "attributeChangedCallback" is present: FAIL (Chrome: PASS, Safari: FAIL)
customElements.define must get four additional callbacks on the prototype if formAssociated is converted to true: FAIL (Chrome: PASS, Safari: FAIL)
customElements.define must rethrow an exception thrown while getting additional formAssociated callbacks on the constructor prototype: FAIL (Chrome: PASS, Safari: FAIL)
customElements.whenDefined must return a resolved promise when the registry contains the entry with the given name: FAIL (Chrome: FAIL, Safari: FAIL)
customElements.whenDefined must return a new resolved promise each time invoked when the registry contains the entry with the given name: FAIL (Chrome: FAIL, Safari: FAIL)
A promise returned by customElements.whenDefined must be resolved by "define": FAIL (Chrome: FAIL, Safari: FAIL)
A promise returned by customElements.whenDefined must be resolved with the defined class: FAIL (Chrome: FAIL, Safari: FAIL)
A promise returned by customElements.whenDefined must be resolved with the defined class once such class is defined: FAIL (Chrome: FAIL, Safari: FAIL)