<!DOCTYPE html>
<style>
.scroller {
  width: 300px;
  height: 200px;
  border: 1px solid black;
}

.sticky {
  position: absolute;;
  left: 0;
  top: 25px;
  width: 100px;
  height: 100px;
  background: green;
}
</style>
This tests position:sticky in non-composited (left) and composited (right) scroller.
<div class="scroller" style="position:absolute; left:50px; top:50px;">
  <div class="sticky"></div>
</div>
<div class="scroller" style="position:absolute; left:450px; top:50px;">
  <div class="sticky"></div>
</div>