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Test Info:

<html>
<head>
<script>
function start() {
const o1 =
document.createElementNS('http://www.w3.org/1999/xhtml', 'slot');
const observer = new ResizeObserverEntry(o1);
typeof observer.borderBoxSize;
typeof observer.contentBoxSize;
}
window.addEventListener('load', start);
</script>
</head>
</html>