HTML6 Should Have Composeable Elements (tech-journals.com)

HTML6? HTML5 isn't even close to being a finalised spec, slow down there. Article makes a good point though.

I feel like this would change a lot of how web frameworks, like RoR, are designed for the better

I've been kind of working on something like this too...

https://github.com/greggbowden/HyperTextComponents

It's still in it's infancy, so be gentle. ;)