r.scrollTop, 500);
  // Snaps to the inner snap area.
  document_scroller.scrollBy(0, 75);
  assert_equals(document_scroller.scrollTop, 600);

  // The middle scroller should now have the inner snap area assigned to it.
  // Per spec, even if the snap-type is 'none', it should still capture snap
  // points.
  middle_scroller.style.setProperty("overflow", "scroll");

  // The middle scroller has snap-type 'none' so it should not snap.
  middle_scroller.scrollBy(0, 10);
  assert_equals(middle_scroller.scroll