chromium/third_party/blink/web_tests/fast/forms/select/stylable-select/new-structure-in-appearance-auto.html

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">

<!-- This test makes sure that we have the same rendering in appearance:auto
     regardless of whether the new button or datalist elements are provided. -->

<select>
  <option>option</option>
</select>

<select>
  <button>button</button>
  <option>option</option>
</select>

<select>
  <datalist>
    <option>option</option>
  </datalist>
</select>

<select>
  <button>button</button>
  <datalist>
    <option>option</option>
  </datalist>
</select>