Evan Minto wrote a great article showing the Internet Archive has tested the actual root font-size set by their visitors, and the result shows a lot of people still change the default one: Pixels vs. Ems: Users DO Change Font Size.
Evan Minto wrote a great article showing the Internet Archive has tested the actual root font-size set by their visitors, and the result shows a lot of people still change the default one: Pixels vs. Ems: Users DO Change Font Size.