.querySelector('#displayNoneScroller');
  const scrollTimeline = new ScrollTimeline(
      { source: scroller, orientation: 'block' });

  assert_equals(scrollTimeline.currentTime, null);
}, 'currentTime should be null for a display: none source');
</script>

<script>
test(function() {
  const scroller = document.createElement('div');
  const content = document.createElement('div');

  scroller.style.overflow = 'auto';
  scroller.style.height = '100px';
  scroller.style.width = '100px';
  content.style.heig