[scroll-marker-selection-picks-closest.html]
  expected: TIMEOUT
  [scroll-marker 0 selected at scrollLeft = 0]
    expected: FAIL

  [scroll-marker 0 selected just before mid point of item0]
    expected: TIMEOUT

  [scroll-marker 1 selected just after mid point of item0]
    expected: NOTRUN

  [scroll-marker 1 selected at left edge of item1]
    expected: NOTRUN

  [scroll-marker 1 selected just before mid point of item1]
    expected: NOTRUN

  [scroll-marker 2 selected just after mid point of item1]
    expected: NOTRUN

  [scroll-marker 2 selected just at left edge of item2]
    expected: NOTRUN