37b369e0d7b7a76287f958857544ca42b480005c
The projection validity extent is used to generate a sensible set of default resolutions and a sensible default tile grid. By making it optional, we can still generate defaults - with zoom levels that are similar to the default web mercator zoom levels (based on fitting the world on a single tile, even if the projection is not available for the whole world).
OpenLayers 3
Welcome to OpenLayers 3!
To see OpenLayers 3 in action you can look at the live examples on http://openlayers.github.io/ol3/master/examples/. If you want to contribute to OpenLayers 3 please read the CONTRIBUTING page.
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