manifest.json

{
    "name": "EmulatorJS Demo",
    "short_name": "EmulatorJS",
    "start_url": "/",
    "id": "org.emulatorjs.demo",
    "scope": "./",
    "display": "standalone",
    "background_color": "#000",
    "theme_color": "#1AAFFF",
    "orientation": "any",
    "description": "EmulatorJS is a frontend for RetroArch in the web browser.",
    "screenshots": [
      {
        "src": "/img/screenshot.png",
        "type": "image/png",
        "sizes": "2560x1440",
        "form_factor": "wide"
      },{
        "src": "/img/mobile_screenshot.png",
        "type": "image/png",
        "sizes": "750x1333",
        "form_factor": "narrow"
      }
    ],
    "icons": [
      {
        "src": "/img/logo.png",
        "type": "image/png",
        "sizes": "512x512"
      },
      {
        "src": "/img/icon.png",
        "sizes": "489x489",
        "type": "image/png",
        "purpose": "maskable"
      }
    ]
  }