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<!DOCTYPE html>
<body>
<script>
document.addEventListener("DOMSubtreeModified", function() {});
document.body.insertAdjacentHTML("afterbegin", "<p>foo");
</script>
<!DOCTYPE html>
<body>
<script>
document.addEventListener("DOMSubtreeModified", function() {});
document.body.insertAdjacentHTML("afterbegin", "<p>foo");
</script>