app/assets/favicons/manifest.json.erb

   1 {
   2         "name": "OpenStreetMap",
   3         "icons": <%= [36, 48, 72, 96, 144, 192].map { |res| {
   4                         src: image_path("android-chrome-#{res}x#{res}.png").gsub("/", "\\/"),
   5                         sizes: "#{res}x#{res}",
   6                         type: "image/png",
   7                         density: res.to_f / 48
   8                 } }.to_json %>,
   9         "start_url": "/",
  10         "display": "minimal-ui"
  11 }