Use CSS rule to separate attributions

css/ol.css

@@ -22,6 +22,9 @@
 .ol-attribution li {
   display: inline;
 }
+.ol-attribution li:not(:last-child):after {
+  content: " ";
+}
 .ol-dragbox {
   position: absolute;
   border: 2px solid red;

src/ol/control/attribution.js

@@ -138,7 +138,7 @@ ol.control.Attribution.prototype.createAttributionElementsForLayer_ =
     var attributionKey = goog.getUid(attribution);
 
     var attributionElement = goog.dom.createElement(goog.dom.TagName.LI);
-    attributionElement.innerHTML = attribution.getHtml() + ' ';
+    attributionElement.innerHTML = attribution.getHtml();
 
     if (!map.isDef ||
         !layerVisible ||