Tutorial: Web based push notifications

The title really says it all, the web now supports push notifications to your desktop and phone and a tutorial on how to set that up on your own site would be awesome.

The issue names no files, tests, or documentation entry point; first inspect the repository’s existing tutorial or documentation structure, then research the web push setup the tutorial should cover. Done means a complete tutorial explaining how to configure web push notifications for a site, with its location and scope aligned to the repository.

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