File: scroll-button-activation-without-scroller.html

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<!doctype html>
<meta charset="utf-8">
<title>CSS Test: ::scroll-button() activation without scroller shouldn't crash</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-buttons">
<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>
div::scroll-button(inline-start) {
  content: "";
  height: 100px;
  width: 100px;
}
</style>
<div></div>
<script>
  promise_test(async t => {
    await new test_driver.Actions()
      .pointerMove(50, 50)
      .pointerDown()
      .pointerUp()
      .pointerDown()
      .pointerUp()
      .send();
    const kTab = '\uE004';
    const kEnter = '\uE007';
    await new test_driver.Actions()
      .keyDown(kTab)
      .keyUp(kTab)
      .keyDown(kEnter)
      .keyUp(kEnter)
      .send();
  });
</script>