[tabindex-focus-flag.svg]
  [iframe should be focusable.]
    expected: FAIL

  [audio[controls\] should be focusable.]
    expected: FAIL

  [video[controls\] should be focusable.]
    expected: FAIL

  [canvas[tabindex\] should be focusable.]
    expected: FAIL

  [mesh[tabindex\] should be focusable.]
    expected: FAIL

  [unknown[tabindex\] should be focusable.]
    expected: FAIL