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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<body onload="
document.body.removeChild(document.getElementById('x'));
document.documentElement.removeAttribute('class');">
<div id="x">
<form id="a">
<select></select>
</form>
<form id="a">
<select></select>
</form>
</div>
<select form="a"></select>
</body>
</html>