[Webkit-unassigned] [Bug 170280] New: Repaint issue Safari 10.1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170280

            Bug ID: 170280
           Summary: Repaint issue Safari 10.1
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wart.claes at gmail.com

On a page with a fixed positioned element in WKWebView renders the element on the wrong place.

This occurs when the element is shown after a user interaction. The element is positioned lower then it should be. This only happens on iOS 10.3 (Safari 10.1). 

The bug was tested on iPhone 5s and iPhone 7.

Link to the github repository https://github.com/WartClaes/ios10.3-bug/tree/master with a simple test case. 
Link to the demo page http://trbo.be/ios/

# Steps to reproduce
1. On initial load, scroll down so the button is in the middle of the screen
2. Click the button
3. The fixed header is now shown somewhere on the page, but not in it’s intended position
4. If you want to select the text “header”, you can notice that the actual element is still on top where it should be, it is just painted in the wrong place

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