[Webkit-unassigned] [Bug 225344] New: localStorage changes aren't reflected between windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225344

            Bug ID: 225344
           Summary: localStorage changes aren't reflected between windows
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jaffathecake at gmail.com

Using Safari 14.1 or later:

1. Tab A: Open https://static-misc-3.glitch.me/localstorage-bug/ in new tab
2. Tab A: Hit 'increment'
3. Tab B: Open https://static-misc-3.glitch.me/localstorage-bug/ in new tab - it displays '1' as expected
4. Tab B: Hit 'increment'

Tab A does not get a 'storage' event, clicking "Re-get value" returns the same value.

It seems like localStorage state is copied at some point, but it doesn't receive any updates after that. However, it's still writing to the underlying data store.

Refreshing the page still returns stale data.

This will result in data loss on websites, as two tabs will be writing to storage, unaware of each others' changes.

Additionally, the 'storage' event is used for cross-tab communication in Safari, since it doesn't support BroadcastChannel, and this bug breaks that. In fact, BroadcastChannel polyfills use the 'storage' event https://github.com/JSmith01/broadcastchannel-polyfill.

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