[interestevent-interface.tentative.html] [source is readonly defaulting to null] expected: FAIL [InterestEventInit properties set value (manual event)] expected: FAIL [InterestEventInit properties set value (beforetoggle event)] expected: FAIL [InterestEventInit properties set value (toggle event)] expected: FAIL [source set to undefined] expected: FAIL [source set to null] expected: FAIL [source set to false] expected: FAIL [source set to true] expected: FAIL [source set to {}] expected: FAIL [source set to non-Element EventTarget] expected: FAIL