[at-scroll-timeline-source-invalidation.tentative.html]
  [Nonexistent source]
    expected: FAIL

  [Inserting a subtree with #scroller descendant]
    expected: FAIL

  [Removing ancestor of source element]
    expected: FAIL

  [Removing source element]
    expected: FAIL

  [Removing id attribute]
    expected: FAIL

  [Setting id attribute]
    expected: FAIL

  [Appending a new element]
    expected: FAIL

  [Setting id attribute earlier in the tree]
    expected: FAIL

