Comment by pmontra

I develop on Firefox and it works on Chrome and Safari with no issues on all OSes (Windows, Mac and Linux). In the extremely rare case when there are some platform specific issues customers tunnel to my dev machine and check the web app (it's Vue) with their iPhones or Macs. I remember only two issues in about 3 years with this customer, all of them with the Apple ecosystem:

1. A form that could not find anymore a picture when they selected it from the Mac Photos app. Apparently Photos creates a temporary file that disappears before the browser submits the form, when probably reads it again from disk. No problems when the picture is loaded from a normal folder. We should read the picture into the memory of the browser and add it to the form from there, of transition to a JSON request. My customer decided that it's a niche case and it's not worth working on it.

2. A slight misalignment of an arrow and a checkbox, but that also happens in a different way with Chrome and Firefox, so there is some structural bug in the DOM/CSS of those UI elements. We're working on that.

Except those issues I can't remember any cross browser or cross OS problems in the last years. If it works in Firefox it works in Chrome and Safari too.