<!DOCTYPE html>
<head>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>

function runTest() {
    const section = document.querySelector('section');
    const container = document.querySelector('div');
    const p = document.querySelector('p');
    const iframe = document.createElement('iframe');
    document.querySelector('b').appendChild(iframe);
    /* div
         + b
           + p
             + script
             + iframe */
    iframe.contentWindow.onunload = () => {
        section.appendChild(p);
        container.remove();
        /* body
           + p
             + script
             + iframe  */
    }

    window.onload = () => {
        let test = async_test('An element removed by the adoption agency algorithm must not be inserted if it had been inserted elsewhere');
        test.step(() => {
            assert_not_equals(p.parentNode, container);
            assert_equals(p.parentNode, section);
        });
        test.done();
    }
}

</script>
</head>
<body>
<section><div><b><p><script>runTest();</script></b></p></div></section>
</body>