[Webkit-unassigned] [Bug 197613] New: Clicks inside iframe doesn't work after it being scrolled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197613

            Bug ID: 197613
           Summary: Clicks inside iframe doesn't work after it being
                    scrolled
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: victorsignup at gmail.com

Created attachment 369123

  --> https://bugs.webkit.org/attachment.cgi?id=369123&action=review

Screen capture of the reproduction case

Elements inside an iframe are unable to be taped after the iframe is scrolled using window.scrollTo() or window.scrollBy().

Reproduction steps:
1. Visit https://victornpb.github.io/ios-scrollable-iframe-issue/
2. Click the buttons on the left, it changes color to show that it is working.
3. Click the "Scroll down" button and it scrolls the iframe down by 50 pixels.
4. After that the buttons doesn't work at all.

A screen capture is attached to this issue as MP4 video.

It works fine on Desktop Safari, this issue only happens on Mobile Safari.

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