'System shock'

So, Medium tried a new thing on their website in which they render the site in system fonts - San Francisco, Roboto, Segoe - but soon they started getting bug reports from people about Medium showing blocky, pixellated fonts.I looked again at all the system fonts and none seemed to match any of the descriptions. What was going on? I started asking for screenshots, and eventually a few trickled in.And, suddenly, I realized I know this font. It was a font I saw on my first PC.I love this story.