// manifest.webmanifest
{
  "icons": [
    { "src": "i/icon-180.png", "type": "image/png", "sizes": "180x180" },
    { "src": "i/icon-256.png", "type": "image/png", "sizes": "256x256" },
    { "src": "i/icon-512.png", "type": "image/png", "sizes": "512x512" }
  ]
}