Exclusively maybe not…
but the reason frameworks like Bootstrap(Twitter) or Foundation(Zurb) have been developed and became so popular is having all the common components that a web developer uses to build a site are built in.
Each component has been thoroughly tested, so you can be confident that they work as tens of thousands of developers use them.
You know they’re compatible with one another as they’ve been designed to work together.
So in the case of foundation you’re loading all the code to do all these powerful functions on each page just waiting for you to execute.
- Top bar
So you load them on each page , they work in harmony together so it’s best if they do what you want to use them.