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chromium/third_party/blink/web_tests/wpt_internal/speech/scripted/speechrecognition-grammars.html 

<!DOCTYPE html>
<title>SpeechRecognition grammars attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
  const sr = new webkitSpeechRecognition();
  assert_true(sr.grammars instanceof webkitSpeechGrammarList);
}, 'initial state');

test(() => {
  for (const value of [null, undefined, {}, "", window]) {
    const sr = new webkitSpeechRecognition();
    const grammars = sr.grammars;
    assert_throws_js(TypeError, () => { sr.grammars = value; } );
    assert_equals(sr.grammars, grammars);
  }
}, 'setting to non-SpeechGrammarList values');

test(() => {
  const sr = new webkitSpeechRecognition();
  const grammars = new webkitSpeechGrammarList();
  sr.grammars = grammars;
  assert_equals(sr.grammars, grammars);
}, 'setting to SpeechGrammarList');
</script>