Using Safari on iPhone or iPad to login to this discourse is quite hard, as the various elements on the screen do not respond correctly to touch events. I’m using iOS 11.0.3
Yeah it super sucks was reported back here:
It is brutal, and still not fixed in ios 11.0.3
Only surefire workaround is for us to stop using position fixed which would be a rather big change. We will wait 1 or 2 more minors before doing something drastic here.