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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-option-element/dynamic-content-change-rendering-ref.html 

<!DOCTYPE html>
<html>
<body>

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

<select multiple>
<option>bar</option>
</select>

</bod>
</html>