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Test Info:

<html>
<head>
<script>
function start() {
const xhr = new XMLHttpRequest();
const observer = new ResizeObserver(entries => {
xhr.open('GET', '', false);
xhr.send();
typeof entries[0].borderBoxSize;
typeof entries[0].contentRect;
typeof entries[0].borderBoxSize;
})
observer.observe(document.getElementById('list'), {});
window.close();
}
document.addEventListener('DOMContentLoaded', start);
</script>
</head>
<body>
<li class="" id="list">
</body>
</html>