<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<div id="root"></div>
<script>
test(function() {
var observer = new IntersectionObserver((changes) => {}, {root: root});
var doc = document.implementation.createDocument("", null);
doc.appendChild(root);
}, "IntersectionObserver with root in a document that has no window does not crash.");
</script>