A More Modern Scale for Web Typography | Design in the browser with web fonts and real content — Typecast
▻http://typecast.com/blog/a-more-modern-scale-for-web-typography
it’s not just the absolute sizes of your type and spacings that must change as screen sizes shrink; the proportions between them must change as well. So I’ve come up with a responsive relative scale to help you achieve a more readable page regardless of device or resolution.