[Webkit-unassigned] [Bug 190269] New: IOS 12 - Service worker cache not shared when added to homescreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190269

            Bug ID: 190269
           Summary: IOS 12 - Service worker cache not shared when added to
                    homescreen
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: corne.alant at gmail.com

On IOS 12, it appears the service worker is shared between Safari and the "Add to Homescreen" Webview but not the cache. That means that once user actions "add to home screen" they will have a service worker installed but not the expected cache.

As many service worker projects do, they precache assets once the service worker is installed. After a user adds the PWA to homescreen, it appears the service worker is still installed but the cache is no longer shared. This behavior is inconsistent with other browsers and the previous versions of IOS.

An issue has also been logged against Workbox JS, a third party library that no longer works on IOS 12 as a consequence of this inconsistency. 

https://github.com/GoogleChrome/workbox/issues/1672

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