third_party/blink/web_tests/external/wpt/keyboard-lock/navigator-keyboard-lock-two-parallel-requests.https.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
 'use strict';

 promise_test((t) => {
   const p1 = navigator.keyboard.lock(["KeyA", "KeyB"]);
   const p2 = navigator.keyboard.lock(["KeyC", "KeyD"]);
   return Promise.all([promise_rejects(t, "AbortError", p1), p2]);
 }, '[Keyboard Lock] keyboard.lock twice in parallel');

 </script>
	<!DOCTYPE html>
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<script>
	'use strict';

	promise_test((t) => {
	const p1 = navigator.keyboard.lock(["KeyA", "KeyB"]);
	const p2 = navigator.keyboard.lock(["KeyC", "KeyD"]);
	return Promise.all([promise_rejects(t, "AbortError", p1), p2]);
	}, '[Keyboard Lock] keyboard.lock twice in parallel');

	</script>