I'm 99% sure that author had designed this website on an Apple Mac with so called "font smoothing" enabled, which makes all regular fonts artificially "semi-bold". So to make a normal looking font, Mac designers use this thinner font weight and then Apple helpfully makes it kinda "normal".
I'm 99% sure that author had designed this website on an Apple Mac with so called "font smoothing" enabled, which makes all regular fonts artificially "semi-bold". So to make a normal looking font, Mac designers use this thinner font weight and then Apple helpfully makes it kinda "normal".
https://news.ycombinator.com/item?id=23553486