<!DOCTYPE html>
<link rel="help" href="https://crbug.com/377948403">
<link rel="match" href="scrollbar-large-scale-in-iframe-ref.html">
<iframe style="position: absolute; top: 100px; left: 100px;
               border: none; width: 100px; height: 100px"
        srcdoc="
  <select multiple style='transform: scale(500, 10)'>
    <optgroup style='height: 1000px'></optgroup>
  </select>">
</iframe>
<div style="position: absolute; top: 100px; left: 100px;
            width: 100px; height: 100px; background: green"></div>