<!DOCTYPE HTML>
<html>
<head>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
</head>
<body>
<script>

promise_test(async t => {
  try {
    stream = await navigator.mediaDevices.getUserMedia(
      {video: {width: {exact: 639}, resizeMode: {exact: "none"}}});
    t.add_cleanup(()=>stream.getVideoTracks()[0].stop());
    t.step(() => assert_unreached('applyConstraints should have failed'));
  } catch(e) {
    assert_true(e instanceof DOMException);
    assert_equals(e.name, 'OverconstrainedError');
    assert_equals(e.constraint, 'width');
  }
}, 'Error of OverconstrainedError type inherit from DOMException');

promise_test(async t => {
    assert_true(new OverconstrainedError("constraint") instanceof DOMException);
}, 'OverconstrainedError class inherits from DOMException');

</script>
</body>
</html>
