Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/rendering/widgets/the-select-element/select-size-ref.html 

<!doctype html>
<title>Test reference.</title>
<select>
  <option value ="1">1</option>
  <option value ="2">2</option>
  <option value ="3">3</option>
</select>