manifest.json

{
    "short_name": "Gov PWA",
    "name": "Well, here's a gov PWA",
    "icons": [
      {
        "src": "/images/donut.svg",
        "type": "image/svg+xml",
        "sizes": "512x512"
      },
      {
        "src": "/images/donut-192.png",
        "type": "image/png",
        "sizes": "192x192"
      }
    ],
    "id": "/?source=pwa",
    "start_url": "/?source=pwa",
    "background_color": "#3367D6",
    "display": "standalone",
    "scope": "/",
    "theme_color": "#3367D6",
    "shortcuts": [
      {
        "name": "Have you seen this page?",
        "short_name": "What a page!",
        "description": "It's another page",
        "url": "/page?source=pwa",
        "icons": [{ "src": "/images/donut-192.png", "sizes": "192x192" }]
      }
    ],
    "description": "An example PWA",
    "screenshots": [
      {
        "src": "/images/screenshot1.png",
        "type": "image/png",
        "sizes": "540x720",
        "form_factor": "narrow"
      },
      {
        "src": "/images/screenshot2.jpg",
        "type": "image/jpg",
        "sizes": "720x540",
        "form_factor": "wide"
      }
    ]
  }