[Webkit-unassigned] [Bug 179885] WKWebView page rendering cut off (affects FireFox on iOS)

[bugzilla-daemon at webkit.org]

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

--- Comment #12 from Richard Newman <rnewman at mozilla.com> ---
As briefly mentioned on the Mozilla bug:

I see this behavior in Firefox v9.3 on my small iPad Pro running iOS 11.1, and I also see it on my phone in a recent Firefox master build, again running a new iOS.

I see this when the browser has been open and loading lots of pages (often relatively large web forum pages) for a while. A force-quit and relaunch fixes it.

My iPad feels relatively sluggish and memory-constrained since upgrading to iOS 11, so I wouldn't be surprised if this were memory-related.

I think the only common factor is iOS 11 (or even 11.1); my iPad has been running Firefox 9.3 for ages, and hadn’t displayed a problem until recently. I also never saw an issue on iOS 10.

My approximate STR:

- Get an iPad Pro.
- Install Firefox.
- Sync your history (I do; might be relevant in increasing memory footprint).
- Open a few dozen tabs on large web forums and other similarly non-trivial pages — having the pages be more than 1.5 screens high seems necessary to see an issue!
- Browse and scroll, browse and scroll, open new tabs, browse and scroll…

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