I was playing around with some css properties recently while working on a project to try and make working with the OSM layer in the ArcGIS JS API a little nicer. The service already looks good, but I kept wishing I had it as a grayscale. Then I found this.

The way I did it was to give my osm layer an id. osm = new esri.layers.OpenStreetMapLayer({ id: 'osmLayer' });

The HTML element that gets created for the layer will be map_LAYER_ID, so map_osmLayer in this case. Then I just apply the css to all img tags in this div.

#map_osmLayer img { filter: url(filters.svg#grayscale) !important; /* Firefox 3.5+ */ filter: gray !important; /* IE5+ */ -webkit-filter: grayscale(1) !important; /* Webkit Nightlies & Chrome Canary */ }`

And voila!

FYI: I know grayscale as used in the CSS I posted works in all browsers (even IE8), but I can't guarantee other filters will work in IE. This comes in really handy, so as only this layer is impacted by the css, my own data can "pop" a bit more. There's more you can do with these fun filters!

OSM Layer: hue-rotate(50deg)

OSM Layer: brightness(-10%) sepia(100%);

OSM Layer: invert(100%);

Of course you can mix and match these css styles, so experiment with them to see what kind of interesting effects you can plug into your maps.