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chromium/third_party/blink/web_tests/external/wpt/infrastructure/testdriver/actions/penPointerEventProperties.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>TestDriver actions: pointerevent properties of pen type</title>
<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#test {
  position: fixed;
  touch-action: none;
  top: 5px;
  left: 5px;
  width: 100px;
  height: 100px;
  background-color: blue;
}
</style>

<div id="test">
</div>

<script>
let pointerDownEvent;
let pointerMoveEvent;
let receivedPointerDown = false;

promise_test(async t => {
  let test = document.getElementById("test");
  var eventList = ['pointermove', 'pointerdown'];
  for (eventType of eventList) {
    test.addEventListener(eventType, e => {
      if (e.type == 'pointerdown') {
        receivedPointerDown = true;
        pointerDownEvent = e;
      }
      if (e.type == 'pointermove' && receivedPointerDown)
        pointerMoveEvent = e;
    });
  }

  let div = document.getElementById("test");
  await new test_driver.Actions()
    .addPointer("penPointer1", "pen")
    .pointerMove(0, 0, {origin: test})
    .pointerDown({pressure:0.36, tiltX:-72, tiltY:9, twist:86})
    .pointerMove(15, 0, {origin: test})
    .pointerUp()
    .send();

    assert_equals(pointerDownEvent.type, "pointerdown");
    assert_equals(pointerDownEvent.pointerType, "pen");
    assert_equals(pointerDownEvent.width, 1);
    assert_equals(pointerDownEvent.height, 1);
    assert_equals(Math.round(pointerDownEvent.pressure * 100) / 100, 0.36);
    assert_equals(pointerDownEvent.tiltX, -72);
    assert_equals(pointerDownEvent.tiltY, 9);
    assert_equals(pointerDownEvent.twist, 86);
    assert_equals(pointerMoveEvent.type, "pointermove");
    assert_equals(pointerMoveEvent.pointerType, "pen");
    assert_equals(pointerMoveEvent.width, 1);
    assert_equals(pointerMoveEvent.height, 1);
    assert_equals(Math.round(pointerMoveEvent.pressure * 100) / 100, 0.5);
    assert_equals(pointerMoveEvent.tiltX, 0);
    assert_equals(pointerMoveEvent.tiltY, 0);
    assert_equals(pointerMoveEvent.twist, 0);
});
</script>