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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-selectlist-element/selectlist-selected-value-behavior-ref.html 

<!DOCTYPE html>
<script src="support/fake-selectlist.js"></script>
<body>
<script>
  const selectlist = createFakeSelectlist('hello world');
  document.body.appendChild(selectlist);
  selectlist.querySelector('.fake-selectlist-selected-value')
    .style.color = 'blue';
</script>