Catching Mac trackpad zoom in OS X Safari [duplicate]

Question

This question asks how to catch a trackpad two-fingers pinch-zoom on a Mac computer.

The accepted answer explains that Chrome for OS X triggers a wheel event with ctrl key pressed when detecting a two-fingers pinch on the trackpad.

Unfortunately, this solution doesn't work in Safari.

How to detect a two-fingers pinch-zoom in OS X Safari with Javascript?

Answer 1

UPDATE : support has been added, see https://stackoverflow.com/a/37183950/1054573

I have been looking exhaustively for a solution to this. Google maps fails to catch the pinch to zoom event in desktop Safari. So I really don't think it's currently possible.