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Test Info:
<!doctype html>
<style>
*:nth-child(odd) {
display: contents;
inset-block: 41%;
scroll-padding-block: 98% auto;
}
</style>
<script>
document.addEventListener("DOMContentLoaded", () => {
a.selectedIndex = 1;
a.remove(0);
window.__foo = a.options.length;
})
</script>
<datalist tabindex="-1">
</datalist>
<select id="a" size="37">
<optgroup>
<option>