[offscreencanvas.transferrable.html]
  [Test that offscreenCanvas's size is correct after being transferred to a worker.]
    expected: FAIL

  [Test that calling getContext('webgl') on a detached OffscreenCanvas throws exception.]
    expected: FAIL

  [Test that transfer an OffscreenCanvas that has a context throws exception.]
    expected: FAIL

  [Test that transfer an OffscreenCanvas twice throws exception.]
    expected: FAIL

  [Test that calling getContext('2d') on a detached OffscreenCanvas throws exception.]
    expected: FAIL

