Built with typographic standards in mind, Baseline makes it easy to develop a website with a pleasing grid and good typography. Baseline starts with several files to reset the browser's default behavior, build a basic typographic layout – including style for HTML forms and new HTML 5 elements – and build a simple grid system. Baseline was born to be a quick way to prototype a website and grew up to become a full typographic framework for the web using real baseline grid as its foundation.

Source: Baseline