Progressive Web App

What is Progressive Web App?

1. It must run under HTTPS.
2. It must include a Web App Manifest. – The web app manifest is a simple JSON file that tells the browser about your web application and how it should behave when ‘installed’ on the user’s mobile device or desktop. Manifest.jason: from https://developers.google.com/web/fundamentals/web-app-manifest/

   {
     "short_name": "Maps",
     "name": "Google Maps",
     "icons": [
       {
         "src": "/images/icons-192.png",
         "type": "image/png",
         "sizes": "192x192"
       },
       {
         "src": "/images/icons-512.png",
         "type": "image/png",
         "sizes": "512x512"
       }
     ],
     "start_url": "/maps/?source=pwa",
     "background_color": "#3367D6",
     "display": "standalone",
     "scope": "/maps/",
     "theme_color": "#3367D6"
   }

3. It must implement a service worker. –  a script that your browser runs in the background.

https://ionicframework.com/pwa