Quote:Google launched a new feature in Chrome 70 that allows users of the web browser to install Progressive Web Apps (PWA) in the browser.

Broken down to the core, Progressive Web Apps turn sites and services on the Internet into something that behaves more like applications. The approach has some benefits, e.g. that users can launch the apps from the operating system's desktop and even use the service offline provided that this is supported.

Offline support depends largely on the application and the functionality that it provides. A Notepad PWA should work fine offline while a service like Spotify or Twitter may not or only in limited capacities as they require access to the Internet to download data to the user device.

PWAs may also use functionality that the operating system provides. On Windows 10 for instance, apps may make use of the notification center of the operating system or follow certain rules and policies.

Note: Linux and Mac OS X users need to enable the chrome://flags/#enable-desktop-pwas policy in the browser by setting it to Enabled. Google plans to add default support for these systems in Chrome 72.

Full reading: https://www.ghacks.net/2018/10/18/how-to-install-progressive-web-apps-in-google-chrome/