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chromium/third_party/blink/web_tests/wpt_internal/speech/scripted/speechrecognitionerror-basics.html 

<!doctype html>
<title>Tests the basics of the SpeechRecognitionError interface</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

test(() => {
  assert_true('webkitSpeechRecognitionError' in window);
  assert_false(webkitSpeechRecognitionError == null);
}, "Check availability of constructor");

</script>