[mask-position-valid.html]
  [e.style['mask-position'\] = "-20% -30px" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "40px top" should set the property value]
    expected: FAIL

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

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

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

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

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

  [e.style['mask-position'\] = "10%" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "right 30% top 60px" should set the property value]
    expected: FAIL

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

  [e.style['mask-position'\] = "right 40%" should set the property value]
    expected: FAIL

  [e.style['mask-position'\] = "center 50px" should set the property value]
    expected: FAIL

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

  [e.style['mask-position'\] = "bottom 10% right 20%" 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" should set the property value]
    expected: FAIL

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

  [e.style['mask-position'\] = "bottom left, right 20%" should set the property value]
    expected: FAIL