[Webkit-unassigned] [Bug 197611] New: CSS propety 'backgound:transparent' don't work in IOS 12.2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197611

            Bug ID: 197611
           Summary: CSS propety 'backgound:transparent' don't  work in IOS
                    12.2
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: liugb1101 at gmail.com

Created attachment 369122

  --> https://bugs.webkit.org/attachment.cgi?id=369122&action=review

video

Since IOS12.2 relased ，our pages occur a bug like this： 

https://img.alicdn.com/tfs/TB18h_pUCzqK1RjSZPxXXc4tVXa-320-569.gif


visit page below in safari and scroll the page , you can feel 

https://pages.tmall.com/wow/chaoshi/act/chaoshi-brand-test  



Depend on the distance that user scroll ，we change the css propety 'backgound:transparent' on the target dom node ，but it seem's not always work as we expected

This bug only can be seen in those device that upgrade IOS12.2

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