chromium/third_party/blink/web_tests/external/wpt/infrastructure/testdriver/click-multiple.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>TestDriver multiple consecutive clicks</title>
<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>

<button type="button" id="button1">Button 1</button>
<button type="button" id="button2">Button 2</button>
<button type="button" id="button3">Button 3</button>

<script>
buttons = [
  document.getElementById("button1"),
  document.getElementById("button2"),
  document.getElementById("button3"),
];

promise_test(async t => {
  clicked = [false, false, false];
  for (let i = 0; i < buttons.length; i++) {
    buttons[i].addEventListener("click", () => {
      clicked[i] = true;
    });
  }

  await Promise.all([
    test_driver.click(buttons[0]),
    test_driver.click(buttons[1]),
    test_driver.click(buttons[2]),
  ]);

  assert_true(clicked[0]);
  assert_true(clicked[1]);
  assert_true(clicked[2]);
});
</script>