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

<!DOCTYPE html>
<meta charset="utf-8">
<title>TestDriver actions: multiple devices</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>

<input type="text" id="text"></input>

<script>
async_test(t => {
  let text_box = document.getElementById("text");
  let actions = new test_driver.Actions()
    .pointerMove(0, 0, {origin: text_box})
    .pointerDown()
    .pointerUp()
    .addTick()
    .keyDown("p")
    .keyUp("p")
    .keyDown("a")
    .keyUp("a")
    .keyDown("s")
    .keyUp("s")
    .keyDown("s")
    .keyUp("s");

  actions.send()
    .then(() => {
      assert_equals(text_box.value, "pass");
      t.done();
    })
    .catch(t.unreached_func("Actions sequence failed"));
});
</script>