Mobile Safari has some horrific hit-testing for touches. There's plenty of places where touching near a control incorrectly snaps the tap to the control (sometimes with rather nasty usability consequences).

Ideally there should be some way to control the tapzone within CSS.

Last time I needed to fix the problem on a page I was responsible for it required adding an HTML element, which was far from ideal. I seem to recall I also had to explicitly add an onclick handler too (registering an onclick handler silently modifies touch behaviour on Safari - a nasty hidden side effect). There's some new badness with stealing taps in iOS26's Safari - ugggh.