[Webkit-unassigned] [Bug 179885] New: WKWebView page rendering cut off

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179885

            Bug ID: 179885
           Summary: WKWebView page rendering cut off
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: garvankeeley at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Video demonstrating the problem:
https://bug1416849.bmoattachments.org/attachment.cgi?id=8927916

The page is not fully rendered and is cut off towards the bottom of the page. The content size of the page is correct and the cut off area is whitespace.

The cut off point appears consistent when consecutive pages are loaded, about 50% longer than the viewport y.

Seems to correlate with memory pressure, but once pressure is relieved, the WKWebView will continue to render pages cutoff.

Reproducibility: Difficult to repro. Firefox iOS has many reports of this, primarily on iPad (various models), and it is highly reproducible given a long enough browsing session for me.

(Firefox iOS X-ref https://bugzilla.mozilla.org/show_bug.cgi?id=1416849)

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