I just installed Safari 10 on my clone and saw no difference is font size.
I think the font issue is that some people had custom font sizes set in Safari. Previously this could be done with a setting for minimum font size. Apparently this preference is gone in Safari 10, hence my post with a Terminal command to set a font size.
On a Mac since 1984. Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.
