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+### Problem we are solving
+
+Playground can't be used while offline.
+
+### Solution
+
+We can make Playground available offline after visiting the Playground.WordPress.net website or installing it as a PWA.
+
+### Project Goal
+
+Allow anyone to use WordPress while offline without a complicated setup.
+
+### Use Cases
+
+This will enable building offline first WordPress apps.
+
+Apps like SPAs and mobile apps that use WordPress as a backend will be able to embed the entire backend in the app and not rely on a server.
+
+### Limitations
+
+We will need to limit the switching of PHP and WordPress versions while offline to ensure users don't download too much data on the first load.
+
+## Project plan
+
+We plan to start by adding PWA support to Playground which will allow users to install it as an app and use it while online.
+
+After that, we need to ensure all assets are available after the first load which will make Playground available offline.
+
+Once Playground works offline we need to restrict some features like version switching while offline and add tests to ensure offline keeps working long-term.
+
+## Development
+
+-   [x] [PWA support](https://github.com/WordPress/wordpress-playground/pull/1086)
+    - [ ] [Separate manifest.json files for each environment](https://github.com/WordPress/wordpress-playground/pull/1615)
+-   [x] [Backfill remote WordPress assets](https://github.com/WordPress/wordpress-playground/pull/1532)
+-   [ ] Backfill Playground assets
+    -   [x] [Generate a list of assets to cache](https://github.com/WordPress/wordpress-playground/pull/1573)
+    -   [ ] [Cache Playground assets to enable offline support ](https://github.com/WordPress/wordpress-playground/pull/1535)
+    -   [x] [Add cache version number](https://github.com/WordPress/wordpress-playground/pull/1541)
+    -   [x] [Set web worker startup options with messages instead of query strings](https://github.com/WordPress/wordpress-playground/pull/1574)
+    -   [ ] Cache Playground static fetch requests
+-   [ ] Offline e2e tests
+    -   [ ] Ensure tests run on a preview version of Playground
+-   [x] [Limit features while offline](https://github.com/WordPress/wordpress-playground/pull/1607/files)
+
+## Notes
+
+-   [Prototype](https://github.com/WordPress/wordpress-playground/pull/1483)
+-   [Project issue](https://github.com/WordPress/wordpress-playground/issues/133)