[mediasource-worker-handle-transfer.html]
  [MediaSourceHandle serialization without transfer must fail, tested in window context]
    expected: FAIL

  [Same MediaSourceHandle transferred multiple times in single postMessage must fail, tested in window context]
    expected: FAIL

  [Attempt to transfer detached MediaSourceHandle must fail, tested in window context]
    expected: FAIL

  [MediaSourceHandle cannot be transferred, immediately after set as srcObject, even if srcObject immediately reset to null]
    expected: FAIL

  [MediaSourceHandle cannot be transferred, if it was srcObject when asynchronous load starts (loadstart), even if srcObject is then immediately reset to null]
    expected: FAIL

  [A detached (already transferred away) MediaSourceHandle cannot successfully load when assigned to srcObject]
    expected: FAIL

  [MediaSourceHandle serialization without transfer must fail, tested in worker]
    expected: FAIL

  [Same MediaSourceHandle transferred multiple times in single postMessage must fail, tested in worker]
    expected: FAIL

  [Precisely one load of the same MediaSourceHandle assigned synchronously to multiple media element srcObjects succeeds]
    expected: FAIL