Double tap breaks on iOS 13.5

[szilardszaloki]

Hi there,
Double tap breaks on iOS 13.5 (Safari, Chrome, Firefox, Opera) with HTML5 canvas element. Out of curiosity, I checked with Edge for iOS as well and surprisingly it works.

[taye]

Can you try calling interact.pointerMoveTolerance(5) to see if that makes any difference?

[szilardszaloki]

I've just checked it, it doesn't help.
It looks like all touch events are broken in general by the way. Even touchstart's event handler doesn't get called the second time when a double tap occurs (the default double tap zoom is triggered though). I might move on to other gestures temporarily, as long as Apple fixes their broken iOS release.

[szilardszaloki]

Hi @taye,
In case you're about to fix it: calling preventDefault() on the touch event itself solves the issue.

[AlwaysAwake]

@szilardszaloki
Isn't it related to Webkit bug?
I found some issues that might be related to this "Skipping Second Touch" behavior in Webkit Bug Tracker.

• https://bugs.webkit.org/show_bug.cgi?id=211521
• https://bugs.webkit.org/show_bug.cgi?id=203786
• https://bugs.webkit.org/show_bug.cgi?id=211179

This bug seems to be starting from iOS 13.4.1 and It's still happening even in 13.6.1
Please see repro here.