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Test Info:

<style>
*:defined { margin-top: 98vmax }
</style>
<script>
document.addEventListener('DOMContentLoaded', () => {
try { a.length = 2 } catch (e) {}
document.execCommand("selectAll", false, null)
try { a.size = 31 } catch (e) {}
})
</script>
<select id="a" dir="rtl"></select>
<keygen autofocus="" contenteditable="true">
AAAA