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chromium/third_party/blink/web_tests/external/wpt/keyboard-lock/navigator-keyboard-lock.https.html 

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

test(function() {
  assert_true(navigator.keyboard instanceof Keyboard);
}, "navigator.keyboard instanceof Keyboard");

test(function() {
  assert_equals(navigator.keyboard, navigator.keyboard);
}, "navigator.keyboard SameObject");

test(function() {
  assert_true(navigator.keyboard.lock instanceof Function);
}, "navigator.keyboard.lock instanceof Function");

test(function() {
  assert_true(navigator.keyboard.unlock instanceof Function);
}, "navigator.keyboard.unlock instanceof Function");

promise_test(() => {
  const p = navigator.keyboard.lock(["KeyA", "KeyB"]);
  assert_true(p instanceof Promise);
  return p;
}, '[Keyboard Lock] keyboard.lock');

</script>