This demo needs to run in its own window, not in an iframe.
How to add Richer Install UI to your web app
Install the app by clicking the button below. After the installation,
the button is disabled.
When you click on install a dialog similar to the ones from app stores
will be displayed.
The dialog includes the `description` and `screenshots` set in the app
manifest.
Screenshots should be different depending if the app is being installed
on a mobile or desktop device, according to the `form_factor` value set
for the screenshots on the manifest