In an ideal world, I'd like to be able to use the CSS framework of my choice e.g. bootstrap, semantic markup for the reasons the author described in the article, and, the ability to extend my semantic classes with the .span2, .container, etc. classes from the framework.

I actually thought about doing it this way by just importing the bootstrap CSS and extending from the various parts, but I realised elements inside the element I'm going to extend from container won't have the container parent class and thus won't get the correct CSS applied.

Does anyone know of something that solves this?