[Webkit-unassigned] [Bug 178066] New: Elements with tag position:fixed disappears (flickering) when a long content is scrolling and appears again when the scroll is finished.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178066

            Bug ID: 178066
           Summary: Elements with tag position:fixed disappears
                    (flickering) when a long content is scrolling and
                    appears again when the scroll is finished.
           Product: WebKit
           Version: WebKit Local Build
          Hardware: All
                OS: iOS 11
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: oscarabilleira at gmail.com

A-  Overview: 
Elements width position:fixed disappears (flickering) when a long content is scrolling and appears again when the scroll is stoped.

B - Steps to Reproduce: 

1) Create a simple html page into a cordova proyect (for example) 

2) Put a div on the top and another on the buttom width "position:fixed" atribute. Include also a long text to make posible scroll it.
I use for my test this simple estructure: http://www.oscarabilleira.com/test_ios/index.php, just copy the source code and create a html file in a cordova proyect for example.

3) When scrolls the text into the webkit the "fixed elements" disappears until the scroll is finished, only if there's a long content to scroll, like in the example. In other situations (randomly) the "flickering efect" can be shown even with a short content to scroll.


C- Expected Results: 
When scroll the content the elements with "position:fixed" tag must be shown all the time even when the content is scrolled.


D- Build Date & Hardware: 
After update to iOS 11 and actually with iOS 11.0.2 
Tested iphone 7, iphone 7 plus and ipad air 2.
Doesn't Occur using iOS 10.x.x or earlier.


E- Additional Information: 
The same like in this old bug 
https://bugs.webkit.org/show_bug.cgi?id=137851

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