On Safari (both iOS and OS X) Safari does not support grid-gap, i.e. "gap" CSS property.
https://developer.mozilla.org/en-US/docs/Web/CSS/gap#support...
I use the fullscreen API to give prototype demos of a product to clients, and iOS [iPhone] Safari doesn't support the fullscreen API.
https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_...
As someone who does not primarily do web development... no. No I do not :). I am trying to get it to do what I want in Chrome and I find I hate it only slightly less than older CSS.
Anecdotally, friends have told me I shouldn't use grid, I should use flexbox instead.
Clearly I'm not meant to be a web developer. Some people like it, I gather.
