tent: "";
    background-color: red;
    height: 100px;
    width: 100px;
    top: 0;
    left: 0;
    position: absolute;
  }

  #scroller.hide::scroll-button(left) {
    display: none;
  }

  #scroller {
    width: 300px;
    height: 300px;
    overflow: auto;
  }

  #filler {
    height: 20000x;
  }
</style>
<div id="scroller">
  <div id="filler"></div>
</div>
<script>
  promise_test(async t => {
    await new test_driver.Actions()
      .pointerMove(15, 15)
      .pointerDown()
      .pointerUp()
      