Top, 10);

  // The document scroller should only snap to the document-level snap area.
  document_scroller.scrollTo(0, 600);
  assert_equals(document_scroller.scrollTop, 500);

  // The inner scroller should now have the innermost snap area assigned to it.
  inner_scroller.style.setProperty("overflow", "scroll");
  inner_scroller.scrollBy(0, 10);
  assert_equals(inner_scroller.scrollTop, 300);

  document_scroller.scrollTo(0, 600);
  assert_equals(document_scroller.scrollTop, 500);

}, "Making an element s