[Webkit-unassigned] [Bug 144875] New: WKWebView does not persist IndexedDB data after app close

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144875

            Bug ID: 144875
           Summary: WKWebView does not persist IndexedDB data after app
                    close
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: iOS 8.2
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nolan at nolanlawson.com

Created attachment 252869
  --> https://bugs.webkit.org/attachment.cgi?id=252869&action=review
Video demonstration

Data saved in IndexedDB in a WKWebView does not appear to survive an app relaunch.

Video demonstration: https://nolanlawson.s3.amazonaws.com/www/apache/iphone_recording.webm

Steps to reproduce:

1. Install my "database filler" Cordova app: https://github.com/nolanlawson/database-filler
2. Follow the instructions to run the app using the WKWebView branch of Cordova
3. Open up the XCode project in platforms/ios
4. Run on a real device
5. Open up the app, add some data, count it to make sure items were added.
6. Double-press the home button to dismiss the app
7. Reopen it, count items

Expected: items that were saved in IndexedDB before are still there.

Actual: 0 items are found.

I'm not sure if this is a bug in WKWebView or in Cordova, but I suspect it's a WKWebView bug because I don't see any option to enable persistence or anything: https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKPreferences_Ref/index.html

Note this is unrelated to issue 137760, which describes how WebSQL is completely disallowed in WKWebView.

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