Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/multicol/listbox-as-multicol.html 

<!DOCTYPE html>
<p>Multicol should have no effect when specified on a SELECT element.</p>
<p>The word 'PASS' should be seen inside the box:</p>
<select size="2" style="-webkit-columns:7; width:6em;">
    <option>PASS</option>
</select>