[Webkit-unassigned] [Bug 190518] New: Safari crashes when viewing Construct HTML5 game in iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190518

            Bug ID: 190518
           Summary: Safari crashes when viewing Construct HTML5 game in
                    iframe
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: valerypopoff at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 352158

  --> https://bugs.webkit.org/attachment.cgi?id=352158&action=review

Safari crash logs and the webpage source

Safari crashes when viewing Construct HTML5 game (https://www.construct.net) in iframe. Viewing the same game NOT on iframe is ok. 
Here's the example of such game:
– No crash: http://valerypopoff.ru/construct/_crash_in_mob_safari/
– Crash: http://valerypopoff.ru/construct/_crash_in_mob_safari/index_iframe.html

Steps to Reproduce:
1. Open http://valerypopoff.ru/construct/_crash_in_mob_safari/index_iframe.html

Expected Results:
The webpage is shown

Actual Results:
Safari crashes with "This web page was reloaded because a problem occurred"

Configuration:
IPhone 6S
IOS 12.1, IOS 12.1

Attached safari crash logs and the webpage source.

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