We'll create fresh WordPress site with Installable installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This plugin uses the Workbox Library https://github.com/GoogleChrome/workbox to turn your website into a progressive web app.
Add to homescreen code was incorporated into this plugin from:
Add to Homescreen v2.0.11 – Copyright (c) 2013 Matteo Spinelli – Released under MIT license