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<!DOCTYPE html>
<script>
window.onload = () => {
const loadResolver = window.opener.loadResolver;
if (loadResolver)
loadResolver();
};
</script>
<input type=range min=0 max=10 value=5>
<script>
const input = document.querySelector('input');
input.onchange = () => window.seenchange = true;
input.oninput = () => window.seeninput = true;
</script>