Offline Shell Wordpress Plugin - Rating, Reviews, Demo & Download

Plugin Description
Offline Shell is a WordPress plugin which utilizes the client side ServiceWorker API to cache theme files for performance and offline purposes.
The WordPress admin can select which files to cache, update the cache list at any time, and see their site performance improve while ensuring important assets are available offline.
Screenshots
File selection screen — the admin may choose which files to cache
The Network tab of DevTools shows that the files have been retrieved from cache instead of network
Debug displays in the console so you know what is and isn’t being cached