Allow embedded objects for whitelisted sites.

I would like my son to be able to use a whitelisted aggregator site - like, for example, y3.com, or any of the multitude of youtube aggregators - and view material embedded in site HTML. However, I don't want him to be able to browse beyond the site itself by clicks/etc., or go multiple levels deep in flash/frames (though I would accept the latter if I could enable the former). I would anticipate this as a configurable option, and probably contrary to ad-blocking.