disconnect-cancel-pending.html | Explore in Territory

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<script>
description('Test that WebKitMutationObserver.disconnect cancels pending delivery');

window.jsTestIsAsync = true;
var mutations;
var observer;

function start() {
    mutations = null;
    div = document.createElement('div');

    observer = new MutationObserver(function(m) {
        mutations = m;
    });

    observer.observe(div, { attributes: true });
    div.setAttribute('foo', 'bar');
    observer.disconnect();
    setTimeout(next, 0);
}

function next() {
    debug('Disconnecting should cancel any pending delivery...');
    shouldBeNull('mutations');
    observer.observe(div, { attributes: true });
    div.setAttribute('bar', 'baz');
    setTimeout(finish, 0);
}

function finish() {
    debug('...and re-observing should not see any of the previously-generated records.');
    shouldBe('mutations.length', '1');
    shouldBe('mutations[0].attributeName', '"bar"');
    finishJSTest();
}

start();
</script>

chromium/third_party/blink/web_tests/fast/dom/MutationObserver/disconnect-cancel-pending.html