chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-select-element/reset-algorithm-rendering.html

<!DOCTYPE html>
<html class="reftest-wait">
<title>Invalidation test on resetting &lt;select></title>
<link rel="help" href="https://html.spec.whatwg.org/C/#the-select-element:concept-form-reset-control">
<link rel="help" href="http://crbug.com/1087031">
<link rel="match" href="reset-algorithm-rendering-ref.html">
<body>

<form>
<select>
<option>Default</option>
<option>Another</option>
</select>

<select>
<option>Another</option>
<option selected>Default</option>
</select>

<select multiple>
<option>option 1</option>
<option>option 2</option>
</select>
</form>

<script>
const selects = document.querySelectorAll('select');
selects[0].selectedIndex = 1;
selects[1].selectedIndex = 0;
selects[2].options[1].selected = true;

document.documentElement.addEventListener('TestRendered', e => {
  document.querySelector('form').reset();
  e.target.removeAttribute('class');
});
</script>

</body>
</html>