chromium/chrome/test/data/banners/manifest_data_url_icon.json

{
  "name": "Manifest test app",
  "icons": [
    {
      "src": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJAAAACQAQMAAADdiHD7AAAABlBMVEUAAAAAAAClZ7nPAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAGklEQVRIie3BMQEAAADCoPVPbQ0PoAAA4NcACrAAAcLJlncAAAAASUVORK5CYII=",
      "type": "image/png",
      "sizes": "192x192"
    }
  ],
  "start_url": "manifest_test_page.html",
  "display": "standalone",
  "orientation": "landscape"
}