chromium/third_party/blink/renderer/core/testing/data/popup/select_mid_screen.html

<!DOCTYPE html>
<style>
  body {
    margin: 0px;
  }
</style>
<div style="padding:50px">
<select id="select">
<option>0</option>
<option>1</option>
<option>2</option>
</select>
</div>