Bug 144913

Summary:	WKWebView does not re-layout fixed positioned element after orientation change
Product:	WebKit	Reporter:	Stefan Arentz <stefan>
Component:	WebKit2	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	benjamin, simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified

Description Stefan Arentz 2015-05-12 07:57:20 PDT

Confirmed on iOS 8.0 and up. Test page at http://bradfrost.com/demo/fixed/index.html

STR:

1) Create a WKWebView, set its frame full screen and set its resizing mask to flexible width/height
2) Load http://bradfrost.com/demo/fixed/index.html
3) See the header and footer correctly positioned and have the width of the screen
4) Change device to landscape
5) See the header and footer still have the original width.

Forcing a re-layout by scrolling a bit makes the header and footer widths update correctly.

In Firefox for iOS we have a workaround for this issue where we nudge the scrollView a bit to force a layout.

See https://github.com/mozilla/firefox-ios/commit/c93880e27c930d3f41cd8f44b1bcbd642ed6c81d#diff-6d1fb0cf203fcd3c299d4ba3f07f21deR130

Comment 1 Radar WebKit Bug Importer 2015-06-11 17:00:19 PDT

<rdar://problem/21350212>