@khmyznikov/pwa-install/docs/manifest.json

PWA install dialog provide more convenience user experience and fix lack of native dialogs in some browsers.

{
    "name": "Progressive Web Application",
    "short_name": "PWA",
    "start_url": "/pwa-install/",
    "display": "standalone",
    "background_color": "#fff",
    "theme_color": "#82307b",
    "description": "Installation component for Progressive Web Application DEMO",
    "icons": [
        {
            "src": "icons/icon@192.png",
            "type": "image/png",
            "sizes": "192x192",
            "purpose": "any"
        },
        {
            "src": "icons/icon@512.png",
            "type": "image/png",
            "sizes": "512x512",
            "purpose": "any"
        }
    ],
	"screenshots": [
		{
			"src": "screenshots/mobile-1.jpg",
			"sizes": "551x979",
			"type": "image/jpeg"
		},
        {
			"src": "screenshots/mobile-2.jpg",
			"sizes": "518x922",
			"type": "image/jpeg"
		},
        {
			"src": "screenshots/mobile-3.jpg",
			"sizes": "518x922",
			"type": "image/jpeg"
		},
        {
			"src": "screenshots/tablet-1.jpg",
			"sizes": "1270x800",
			"type": "image/jpeg",
			"form_factor": "wide"
		},
        {
			"src": "screenshots/tablet-2.jpg",
			"sizes": "1270x800",
			"type": "image/jpeg",
			"form_factor": "wide"
		}
	],
	"related_applications": [
		{
			"platform": "play",
			"id": "com.learnpwa.app",
			"url": "https://play.google.com/store/apps/details?id=com.learnpwa.app"
		},
		{
			"platform": "webapp",
			"url": "manifest.json"
		}
	]
  }