Bug 98439 – MutationRecord oldValue should be null when *OldValue is false

• Component: DOM
• Status: RESOLVED WORKSFORME

[Erik Arvidsson]

For {characterData: true} oldValue should be null and not ''

var text = document.createTextNode('abc');
var observer = new WebKitMutationObserver(function() {});
observer.observe(text, {
  characterData: true
});
text.data = 'def';

var records = observer.takeRecords();
shouldBeNull('records[0].attributeName')

[Adam Klein]

I can't reproduce this problem. Your test case doesn't actually test oldValue; I think if you do, you'll find it is null (as oldValue is already properly annotated in MutationRecord.idl).