[Webkit-unassigned] [Bug 227066] New: Touch events lost in bottom 10% to 20% of screen when rapidly tapping

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227066

            Bug ID: 227066
           Summary: Touch events lost in bottom 10% to 20% of screen when
                    rapidly tapping
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: syau at snapchat.com

Example: https://yaustar.github.io/ios-touch-issue.html
Source: https://github.com/yaustar/yaustar.github.io/blob/master/ios-touch-issue.html

The text at the top shows the number of changed touches, the id of the first changed touch in the event, the X / Y position of the first changed touch in the event.

Touching the left side of the screen makes it go white, the right, red

When rapid tapping the left and right of the screen (0.5s between each touch) in middle or top (portrait), the screen will flip between white and red.

When doing the same at the bottom 10% or 20% of the screen, some touches are lost so the screen stays white or red.

Is there some extra logic happening at the bottom 10/20% of the screen?

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