Hi! Creator here (of iOS404) - you can filter level of standard and compare to FF Android (or compare to Safari Desktop, or any mix) instead if you'd like.
It's called iOS404, not "FF" or "Chrome" and pushes the narrative that iOS is bad, and missing features.
There are 34 features listed (IIRC it did contain a bunch of Chrome-only crap once upon the time, hence my harsh reaction). All of them enabled by default. If we limit this only to actual, you know, standards, and not "scribbled on a napkin, awaits review", we get a grand total of 9 (yes, nine). And even there many are not "not implemented" but "missing some features (sometimes big, sometimes small and irrelevant)".
Are you mad because they probably found the same thing I did when doing web stuff that had to run on iOS (going as far back as about 2012~) that iOS required so much more hoop jumping, hacks, polyfills etc? It was just assumed that every other platform worked fine, time was always allocated for inevitable issues on mobile Safari.
Yep - the site has a point of view but rooted in real data that you can filter as you'd like.
I've had real-world experiences where I develop something that works on my Mac and my Pixel phone but cannot work on iOS WebKit (basically kaputt on iPhones). It inspired the creation of the site - specifically not being able to allow users to have Audio at anything but 100% seemed extremely weird.
I'm not offended by sites that also point out issues with a slant against Google. Ie: killedbygoogle - I think these things are great, fun, and interesting.
There are 34 features listed (IIRC it did contain a bunch of Chrome-only crap once upon the time, hence my harsh reaction). All of them enabled by default. If we limit this only to actual, you know, standards, and not "scribbled on a napkin, awaits review", we get a grand total of 9 (yes, nine). And even there many are not "not implemented" but "missing some features (sometimes big, sometimes small and irrelevant)".