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chromium/third_party/blink/web_tests/external/wpt/dom/events/focus-event-document-move.html 

<!DOCTYPE html>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://crbug.com/747207">
<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>

<script>
  function handleDown(node) {
    var d2 = new Document();
    d2.appendChild(node);
  }
</script>

<!-- No crash should occur if a node is moved during mousedown. -->
<div id='click' onmousedown='handleDown(this)'>Click me</div>

<script>
  const target = document.getElementById('click');
  async_test(t => {
    let actions = new test_driver.Actions()
      .pointerMove(0, 0, {origin: target})
      .pointerDown()
      .pointerUp()
      .send()
      .then(t.step_func_done(() => {
        assert_equals(null,document.getElementById('click'));
      }))
      .catch(e => t.step_func(() => assert_unreached('Error')));
  },'Moving a node during mousedown should not crash');
</script>