See example in https://codepen.io/chadoh/pen/gWyBzV Safari tries to be smart and not allow users to focus a field that wouldn't be usable. The problem is that fields can be focused by clicking on their label or tabbing into them, and either CSS `:focus` styles or JS may make the field usable upon such an action.
Does this affect any live web sites?
I have not crawled the internet to check, but probably? It was affecting a website I built, until customers reported a bug, and I tracked down the issue to this bug in Safari.
We disagree with Chrome and Firefox here.
<rdar://problem/33891085>
Fixed in https://trac.webkit.org/changeset/226823 *** This bug has been marked as a duplicate of bug 181516 ***