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

<!DOCTYPE html>
<meta charset="utf-8">
<title>TestDriver actions: pointerevent properties of touch 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;

async_test(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");
  let actions = new test_driver.Actions()
    .addPointer("touchPointer1", "touch")
    .pointerMove(0, 0, {origin: test})
    .pointerDown({width:23, height:31, pressure:0.78})
    .pointerMove(15, 0, {origin: test, width:39, height:35, pressure:0.91})
    .pointerUp()
    .send()
    .then(t.step_func_done(() => {
      assert_equals(pointerDownEvent.type, "pointerdown");
      assert_equals(pointerDownEvent.pointerType, "touch");
      assert_equals(pointerDownEvent.width, 23);
      assert_equals(pointerDownEvent.height, 31);
      assert_equals(Math.round(pointerDownEvent.pressure * 100) / 100, 0.78);
      assert_equals(pointerDownEvent.tiltX, 0);
      assert_equals(pointerDownEvent.tiltY, 0);
      assert_equals(pointerDownEvent.twist, 0);
      assert_equals(pointerMoveEvent.type, "pointermove");
      assert_equals(pointerMoveEvent.pointerType, "touch");
      assert_equals(pointerMoveEvent.width, 39);
      assert_equals(pointerMoveEvent.height, 35);
      assert_equals(Math.round(pointerMoveEvent.pressure * 100) / 100, 0.91);
      assert_equals(pointerMoveEvent.tiltX, 0);
      assert_equals(pointerMoveEvent.tiltY, 0);
      assert_equals(pointerMoveEvent.twist, 0);
  })).catch(e => t.step_func(() => assert_unreached("Actions sequence failed " + e)));
});
</script>