[Webkit-unassigned] [Bug 181079] New: Service Worker dynamic online/offline handling doesn't work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=181079

            Bug ID: 181079
           Summary: Service Worker dynamic online/offline handling doesn't
                    work
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomac at google.com

Created attachment 330018

  --> https://bugs.webkit.org/attachment.cgi?id=330018&action=review

Offline snackbar in Chrome

Steps to reproduce:
1) Go to https://www.trivago.com/las-vegas-34741/hotel.
2) Refresh to be sure the Service Worker is installed and active.
3) Turn Wi-Fi off. 
4) Reload. 
5) Offline fallback page shows (maze game).

Expected behavior:
After step 3) a "snackbar" UI component "you're offline should show (see Chrome screenshot attached).

This is most probably related to https://bugs.webkit.org/show_bug.cgi?id=32327#c6.

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