Change to the standard: https://github.com/whatwg/html/pull/2777. Rendered: search for enumerable in https://html.spec.whatwg.org/multipage/browsers.html#cross-origin-objects. Change to tests: https://github.com/w3c/web-platform-tests/pull/6538. Note: this is a change that all browsers need to make.
I have a fix, but the changes to the tests that have landed so far are buggy: see https://github.com/w3c/web-platform-tests/pull/6538#discussion_r128099025 Waiting for the test situation to be resolved...
Assignee: nobody → bzbarsky
Status: NEW → ASSIGNED
Attachment #8887660 - Flags: review?(bobbyholley) → review+
Attachment #8887660 - Attachment is obsolete: true
Attachment #8887771 - Attachment is obsolete: true
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/be396a7cf55b Make cross-origin-exposed non-symbol properties enumerable. r=bholley
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