Fluid Typography
All fonts on this page have a fixed size at small and large screen sizes, but smoothly change size over a range of screen-widths. Done using CSS, vh units as baseline, ems for secondary sizing, and media queries for the range of sizes where the transition occurs.
The effect is very visible: baseline font sizes going smoothly from 1em to 1.1em between 50em and 75em screenwidth. This fluid typography is inline CSS, copy this to any page that needs it.
Finally this typeface is domine, served by those nice Google people. Possible ligatures: fl, fi, ff.