This is going to be a very interesting debate moving forward. Flash has shown what happens if you let all elements of a page have the same rights to resources -

This is going to be a very interesting debate moving forward. Flash has shown what happens if you let all elements of a page have the same rights to resources - and Adobe is working on ways of dealing with the issue. Now HTML5 is going to have to deal with the problem and they we'll have to wait until browsers make their own implementation of a solution that will probably be similar to Adobe's eventual solution.