Bug 186622

Summary:	documentElement clientHeight does not include safe-area
Product:	WebKit	Reporter:	Darryl Pogue <dvpdiner2>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	bdakin, bfulgham, jonlee, simon.fraser, thorton, zalan
Priority:	P2
Version:	Safari 11
Hardware:	Unspecified
OS:	iOS 11

Description Darryl Pogue 2018-06-14 10:08:24 PDT

On an iPhone X running iOS 11.4 with a full-screen WKWebView and viewport-fit=cover, `document.documentElement.clientHeight` returns 734.
The actual screen height (as reported by `screen.availHeight`) is 812.

If viewport-fit=cover is specified, I would expect the clientHeight to be the full height of the screen, without subtracting the safe-area insets (since they are not being applied due to the viewport directive).

This is also occurring in iOS 12.0 beta 1.