I have seen testers with full color vision test color contrast ratios based on edges only (pixels) of text affected by font anti-aliasing. This is pointless and serves to dilute the premise.
All websites should be readable in Firefox or Safari (or Chrome but I don't use that) with the minimum font size set larger than the default. I use 18 min and a lot of stuff breaks. I'm sure that other people would greatly benefit from even larger fonts.
I don't care about "pretty". I'm resigned to not getting that. But a lot of text simply disappears when the minimum font size is bumped up.
At least Firefox manages to render most sites at a decent size when I set 18 min. Safari, for some reason, still struggles with that.
Also, I generally read everything using Lucida Grande. It's a nice legible font. Firefox allows me to force that font. Safari doesn't. Just how fucking hard would it be for Apple to let me choose my own font in Safari?
Technically not "let me choose my own font in Safari" but you can set a user style sheet which overrides fonts.
https://kgrz.io/safari-custom-user-agent-css-overrides-using...
They do, however, provide several options for dealing with this in their Accessibility settings - "Increase contrast", "Differentiate without colour", "Reduce transparency", etc.