Create legend with OpenLayers 3 / GeoServer

If you just want to display a static legend you can just put your request into an img-tag:

 <div id="legend">
        <img src="http://localhost:8080/geoserver/wms?REQUEST=GetLegendGraphic&VERSION=1.0.0&FORMAT=image/png&WIDTH=20&HEIGHT=20&LAYER=cite:censustractsum&STYLE=basicstyle9">
 </div>

see http://jsfiddle.net/expedio/od5eLpb9/