[scrollsnapchanging-on-user-root-scroll.tentative.html]
  expected: TIMEOUT
  [touch scrolling fires scrollsnapchanging.]
    expected: FAIL

  [mouse wheel scroll triggers scrollsnapchanging.]
    expected: FAIL

  [scrollbar dragging fires scrollsnapchanging.]
    expected: FAIL

  [keyboard scroll triggers scrollsnapchanging.]
    expected: FAIL

  [touch scrolling fires Document.onscrollsnapchanging.]
    expected: FAIL

  [scrollsnapchanging fires as scroll moves through different snap targets.]
    expected: TIMEOUT

  [scrollsnapchanging doesn't fire if scroll doesn't reach different snap targets.]
    expected: NOTRUN