9d3a4e3c6cad6a60b3e3ba2d292d0e49188ccd33
If you know ahead of time that you only want to listen for changes for a specific property, the foo:change type events can be useful. If you want to listen for changes on all properties, the change event becomes more useful if it provides information on what changed. And the beforechange event allows listeners to access values before they change.
OpenLayers 3
Welcome to OpenLayers 3!
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