File: pointerdown-add-overflow-hidden.html

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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<head>
<title>Test dragging still occurs when pointerdown adds overflow:hidden to the dragged element</title>
<style>
.dragging {
  overflow: hidden;
}
</style>
</head>
<body>
<li id="item" draggable="true">
  Item 1
</li>
<script>

promise_test(function() {
  return new Promise(r => {
    item.addEventListener("pointerdown", function() {
      item.classList.add("dragging");
    });

    item.addEventListener("dragstart", function(e) {
      assert_equals(e.target, item);
      r();
    });

    new test_driver.Actions()
    .pointerMove(0, 0, {origin: item})
    .pointerDown()
    .pointerMove(10, 10, {origin: item})
    .pointerUp()
    .send();
  });
}, "dragstart should still fire when the dragged element gets overflow:hidden in its pointerdown");
</script>
</body>
</html>