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Test Info: Warnings

<html class="reftest-wait">
<script>
let pp;
window.addEventListener("MozReftestInvalidate", finish);
window.onload = () => {
try { document.getElementById('a').setAttribute('style', 'left:76%') } catch (e) {}
pp = SpecialPowers.wrap(self).printPreview();
pp?.print()
setTimeout(window.close, 250)
}
function finish() {
setTimeout(function() {
pp.close();
document.documentElement.className = "";
}, 400);
}
</script>
<style>
:last-of-type {
position: relative;
}
</style>
<select>
<optgroup label='y'>
<option>
</select>
<video id='a'>
</html>