[constructor.html]
  [A ScrollTimeline created with a null source should have no source]
    expected: FAIL

  [A ScrollTimeline can be created with a source]
    expected: FAIL

  [A ScrollTimeline created without a source should use the document.scrollingElement]
    expected: FAIL

  [A ScrollTimeline can be created with a non-scrolling source]
    expected: FAIL

  [Creating a ScrollTimeline with an invalid axis value should throw]
    expected: FAIL

  [A ScrollTimeline created with the default axis should default to 'block']
    expected: FAIL

  ['block' is a valid axis value]
    expected: FAIL

  ['inline' is a valid axis value]
    expected: FAIL

  ['y' is a valid axis value]
    expected: FAIL

  ['x' is a valid axis value]
    expected: FAIL
