[mask-position-valid.html]
  expected:
    if (os == "android") and fission: [OK, TIMEOUT]
  [e.style['mask-position'\] = "10%" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "30px center" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "center bottom" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "center left" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "left" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "top" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "top center" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "center" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "top, center, left" should set the property value]
    expected: FAIL