[tabindex-focus-flag.svg]
  expected:
    if (os == "android") and fission: [OK, TIMEOUT]
  [rect[focusable=true\] should be focusable.]
    expected: FAIL

  [a[focusable=false\] should not be focusable.]
    expected: FAIL

  [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