[mask-valid.sub.html]
  [e.style['mask'\] = "linear-gradient(to left bottom, red, blue) stroke-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "linear-gradient(to left bottom, red, blue) luminance" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none no-clip" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "linear-gradient(to left bottom, red, blue) padding-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "url(\\"https://web-platform.test/\\") intersect" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "linear-gradient(to left bottom, red, blue) exclude" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none border-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none margin-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none repeat-y" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none subtract" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "url(\\"https://web-platform.test/\\") add" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none alpha" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "intersect no-clip space round 1px 2px / contain view-box, stroke-box linear-gradient(to left bottom, red, blue) luminance" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "url(\\"https://web-platform.test/\\") 1px 2px / contain" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "intersect no-clip space round 1px 2px / contain stroke-box linear-gradient(to left bottom, red, blue) luminance" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "linear-gradient(to left bottom, red, blue) 1px 2px" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "linear-gradient(to left bottom, red, blue)" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "url(\\"https://web-platform.test/\\") alpha" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none content-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "url(\\"https://web-platform.test/\\") fill-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "none view-box" should set the property value]
    expected: FAIL

  [e.style['mask'\] = "url(\\"https://web-platform.test/\\")" should set the property value]
    expected: FAIL