File: insertAdjacentElement-with-DOMSubtreeModified.html

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<!DOCTYPE html>
<head>
<script src="../resources/js-test.js"></script>
<script>
function onLoad() {
    const x1 = document.getElementById('x1');
    x1.addEventListener('DOMSubtreeModified', () => {
        const x2 = document.getElementById('x2');
        x2.contentDocument;
    });
    x1.setAttribute('inputmode', 'url');
}
function insertAdjacent() {
    const x2 = document.getElementById('x2');
    const x3 = document.getElementById('x3');
    document.onreadystatechange = insertAdjacent;
    x3.insertAdjacentElement('beforebegin', x2);
}
</script>
</head>
<body onload="onLoad()">
<div id="x1"></div>
<object id="x2" data="invalid-url" onerror="insertAdjacent()"></object>
<div id="x3"></div>
</body>
</html>