mutation-record-nullity.html | Explore in Territory

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<script>
description('Non-relevant properties on mutation records should be null, except for NodeLists, which should be empty');
var observer = new MutationObserver(function() {});

var text = document.createTextNode('something');
observer.observe(text, {characterData: true});
text.data = 'something else';
var record = observer.takeRecords()[0];
debug('characterData record:');
shouldBeNull('record.attributeName');
shouldBeNull('record.attributeNamespace');
shouldBeNull('record.oldValue');
shouldBeNull('record.previousSibling');
shouldBeNull('record.nextSibling');
shouldBe('record.addedNodes.length', '0');
shouldBe('record.removedNodes.length', '0');

var div = document.createElement('div');
observer.observe(div, {childList: true});
div.appendChild(document.createElement('span'));
record = observer.takeRecords()[0];
debug('\nchildList record:');
shouldBeNull('record.attributeName');
shouldBeNull('record.attributeNamespace');
shouldBeNull('record.oldValue');

observer.observe(div, {attributes: true});
div.setAttribute('data-foo', 'bar');
record = observer.takeRecords()[0];
debug('\nattributes record:');
shouldBeNull('record.attributeNamespace');
shouldBeNull('record.oldValue');
shouldBeNull('record.previousSibling');
shouldBeNull('record.nextSibling');
shouldBe('record.addedNodes.length', '0');
shouldBe('record.removedNodes.length', '0');
</script>
chromium/third_party/blink/web_tests/fast/dom/MutationObserver/mutation-record-nullity.html
