testing/web-platform/tests/html/semantics/forms/the-selectlist-element/selectlist-marker-part-ref.html


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<!DOCTYPE html>
<script src="support/fake-selectlist.js"></script>
<body>
<script>
  const selectlist = createFakeSelectlist('hello world');
  document.body.appendChild(selectlist);
  selectlist.querySelector('.fake-selectlist-internal-selectlist-button-icon')
    .style.backgroundColor = 'red';
</script>