File: scroll-button-display-none.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Overflow Test: focused ::scroll-button() does not crash after becoming display none</title>
<link rel="help" href="http://crbug.com/402673873">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
  #scroller::scroll-button(left) {
    content: "";
    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()
      .send();
    scroller.className = "hide";
    document.documentElement.offsetTop;
    await new test_driver.Actions()
      .pointerMove(15, 15)
      .pointerDown()
      .pointerUp()
      .send();
    assert_true(true);
  });
</script>