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

<!doctype html>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>

<input type=text>
<script>
let input = document.getElementsByTagName("input")[0];
addEventListener("load", async () => {
    let searchParams = new URLSearchParams(location.search);
    let testContext = searchParams.has("parent") ? parent : opener;
    test_driver.set_test_context(testContext);
    await new test_driver.Actions()
     .pointerMove(0, 0, {origin: input})
     .pointerDown()
     .pointerUp()
     .send();
    await new test_driver.Actions()
     .keyDown("P")
     .keyUp("P")
     .keyDown("A")
     .keyUp("A")
     .keyDown("S")
     .keyUp("S")
     .keyDown("S")
     .keyUp("S")
     .send();
    if (input.value === "PASS") {
      test_driver.message_test("PASS", "*");
    } else {
      test_driver.message_test("FAIL", "*");
    }
});
</script>