removed-out-of-order.html | Explore in Territory

<!DOCTYPE html>
<div id="sandbox" style="display:none"></div>
<script src="../../../../../resources/js-test.js"></script>
<script>
description("Test MutationEvents interfering with MutationObservers: removing nodes 'out of order'");
var sandbox = document.getElementById('sandbox');
var removed = false;
sandbox.addEventListener('DOMNodeInserted', function() {
    if (!removed) {
        sandbox.removeChild(sandbox.firstChild);
        removed = true;
    }
});
var observer = new MutationObserver(function(){});
observer.observe(sandbox, {childList: true});
sandbox.innerHTML = '<b></b><i></i>';

var mutations = observer.takeRecords();
shouldBe("mutations.length", "2");
shouldBe("mutations[0].addedNodes.length", "2");
shouldBe("mutations[0].removedNodes.length", "0");
shouldBe("mutations[0].addedNodes[0].tagName", "'B'");
shouldBe("mutations[1].addedNodes.length", "0");
shouldBe("mutations[1].removedNodes.length", "1");
shouldBe("mutations[1].removedNodes[0].tagName", "'B'");
shouldBeUndefined("mutations[1].addedNodes[0]");
</script>
</script>

chromium/third_party/blink/web_tests/dom/mutation-event-tests/fast/dom/MutationObserver/removed-out-of-order.html