third_party/WebKit/Source/web/tests/data/trivial-scroller.html

<!DOCTYPE HTML>
<style>
#scroller {
  width: 100px;
  height: 100px;
  overflow: scroll;
  will-change: transform;
}
.scrolled {
  background: blue;
  width: 50px;
  height: 180px;
}
</style>
<div id="scroller">
  <div class="scrolled"></div>
</div>