<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test.js"></script>
<script>

description('This tests adopting a shadow tree with an Attr node.');

var referenceCountInSource;
var referenceCountInDestination;
function runTest() {
    let startCount = internals.referencingNodeCount(document);

    const outerHost = document.createElement('shadow-host');
    document.body.appendChild(outerHost);
    const outerRoot = outerHost.attachShadow({mode: 'closed'});
    outerRoot.innerHTML = '<span title="foo"></span>';

    const innerHost = outerRoot.firstChild;
    const innerRoot = innerHost.attachShadow({mode: 'closed'});
    innerRoot.innerHTML = '<div lang="en"></div>';

    const outerAttr = innerHost.attributes[0];
    const outerAttrNodeList = outerAttr.childNodes;
    const innerAttr = innerRoot.firstChild.attributes[0];
    const innerAttrNodeList = innerAttr.childNodes;

    referenceCountInSource = internals.referencingNodeCount(document) - startCount;

    const iframe = document.createElement('iframe');
    document.body.appendChild(iframe);

    startCount = internals.referencingNodeCount(iframe.contentDocument);
    iframe.contentDocument.body.appendChild(outerHost);
    referenceCountInDestination = internals.referencingNodeCount(iframe.contentDocument) - startCount;

    iframe.remove();
}

if (!window.GCController || !window.internals)
    testFailed('This test requires testRunner, internals, and GCController objects.');
else {
    runTest();
    GCController.collect();
    shouldBe('referenceCountInDestination', 'referenceCountInSource');
}

</script>
</body>
</html>