I googled but couldn\'t find an answer.
Is there a cross-browser compatibility matrix available for this feature?
In case anybody wants to know the answer, here
This feature (DOM mutation) is working from Chrome 18. You can see more details here: http://updates.html5rocks.com/2012/02/Detect-DOM-changes-with-Mutation-Observers
In case you wish to check 'any' HTML5 feature and the browsers that support it: http://caniuse.com/ is the place. Other great source is: http://html5please.com/