[tasks.window.html]
  expected: TIMEOUT
  [document.open() and tasks (MessagePort)]
    expected: FAIL

  [tasks without document.open() (MessagePort)]
    expected: FAIL

  [document.open() and tasks (canvas.toBlob())]
    expected: FAIL

  [document.open() and tasks (marquee start)]
    expected: TIMEOUT

  [tasks without document.open() (marquee start)]
    expected: TIMEOUT

  [tasks without document.open() (canvas.toBlob())]
    expected: FAIL