Is there a non-hacky way to prevent pinch zoom on iOS 11.3 Safari?

Question

I really want to disable pinch to zoom on my webpages (iframes) and use finger pinching events for another custom interaction. So while Apple in their documentation

Answer 1

From How do you disable viewport zooming on Mobile Safari?

Try adding the following to your head-tag:

additionally

Finally, either as a style-attribute or in your css file, add the following text for webkit-based Browsers:

html {
    -webkit-text-size-adjust: none
}