On mobile phones, I’ve seen many websites where the font size was adjusted down to still have 70 characters per line, but it’s then difficult to read. Just tur

On mobile phones, I’ve seen many websites where the font size was adjusted down to still have 70 characters per line, but it’s then difficult to read. Just turn on reader mode on on this very website, and you’ll see more like 45 characters per line. I wish this article would have explored the mobile space better instead of saying “it’s less of an issue”. I’m wondering if there is an underlying rule to all this: perhaps a readable line is one that has a minimum angular height and length in the visual field. From there, we could use relative viewing distance from the device and advise on a target physical font size and line length?