"2" behavior="alternate">&nbsp;</marquee>
<marquee width="1" loop="2">&nbsp;</marquee>

<script>
test(() => {
  assert_false("onstart" in HTMLMarqueeElement.prototype, "onstart");
  assert_false("onfinish" in HTMLMarqueeElement.prototype, "onfinish");
  assert_false("onbounce" in HTMLMarqueeElement.prototype, "onbounce");
}, "Event handler IDL attributes must not be implemented");

// Because we use width="1" they will bounce and finish really fast
async_test(t => {
  for (const m of document.querySelectorA