[Webkit-unassigned] [Bug 149746] New: iOS position:fixed/z-index looses attachment during focus event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149746

            Bug ID: 149746
           Summary: iOS position:fixed/z-index looses attachment during
                    focus event
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iOS
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scott.davis at united.com

On iOS devices seen on build Chrome 44 and current build of Safari. (Was OK in Chrome 40) 

A header element with position:fixed;z-index:1000;top:0 becomes unfixed and lands over content during focus on element such as input element. On blur event, position:fixed is restored

This is hard to demo as position:fixed seems broken in iframe, so codepens with position:fixed seems not to be fixed in ANY state:

https://codepen.io/paulirish/pen/CgAof
http://davidwalsh.name/demo/css-fixed-position.php
http://codepen.io/parkerbennett/full/lzqEH

My work-around solution is to script a change in layout from position:fixed to position:absolute during .focus and return to position:fixed with .blur.

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