manifest.json

{
  "name": "Snap!",
  "short_name": "Snap!",
  "icons": [{
      "src": "img/snap-icon-72.png",
      "sizes": "72x72",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-96.png",
      "sizes": "96x96",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-120.png",
      "sizes": "120x120",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-128.png",
      "sizes": "128x128",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-144.png",
      "sizes": "144x144",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-152.png",
      "sizes": "152x152",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-192.png",
      "sizes": "192x192",
      "type": "image/png",
      "purpose": "any maskable"
    }, {
      "src": "img/snap-icon-256.png",
      "sizes": "256x256",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-384.png",
      "sizes": "384x384",
      "type": "image/png"
    }, {
      "src": "img/snap-icon-512.png",
      "sizes": "512x512",
      "type": "image/png"
    }],
  "lang": "en-US",
  "start_url": "./snap.html",
  "display": "standalone",
  "background_color": "white",
  "theme_color": "white"
}