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

{
  "name": "Manifest test app",
  "icons": [
    {
      "src": "launcher-icon-1x.png",
      "sizes": "48x48",
      "type": "image/png"
    }
  ],
  "start_url": "manifest_test_page.html",
  "display": "fullscreen",
  "protocol_handlers": [
    {
      "protocol": "mailto",
      "url": "?mailto=%s"
    },
    {
      "protocol": "web+testing",
      "url": "?testing=%s"
    },
    {
      "protocol": "web+notoken",
      "url": "/?"
    },
    {
      "protocol": "web+nourl"
    }
  ]
}