This is a testharness.js-based test.
PASS SourceBuffer#abort() (video/webm; codecs="vorbis,vp8") : If the readyState attribute of the parent media source is not in the "open" state then throw an INVALID_STATE_ERR exception and abort these steps.
FAIL SourceBuffer#abort() (video/mp4) : If the readyState attribute of the parent media source is not in the "open" state then throw an INVALID_STATE_ERR exception and abort these steps. assert_unreached: Browser doesn't support the MIME used in this test: video/mp4 Reached unreachable code
Harness: the test ran to completion.