Attempt to utilize css trick to detect element insertion

I was trying to figure out how to utilize David's trick (http://davidwalsh.name/detect-node-insertion) for this component. I've come up with this so far.

Problems with this approach:
* Extra class required for every insert
* Selector based matching
* Only inserted element can be detected (i.e. I had to change test.html)
* Browser compatibility

Not really expecting a merge. Just curious if it could be useful/improved :)