Specify Minimum Font Size in Safari 10.0, macOS Sierra The Minimum Font Size option seems to be missing in Safari 10.0 / macOS Sierra.  It's been replaced by Page Zoom (prefs > advanced).  I'm specifically asking how to prevent Safari in Sierra from ever using a font size below a certain value.  I don't want to have to fix this on a site by site basis.

Let's say I want to set 11px as the minimum font size in Safari on macOS Sierra.  How do I do this?
use 

defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2MinimumFontSize -int 14


… restart Safari, be happy again! (replace 14 with whatever suits you)

edit: as OP said, paste the line into terminal, sorry for omitting this initially!