Spacing Issue in build

examples/export-map.js

@@ -36,9 +36,26 @@ var map = new ol.Map({
 document.getElementById('export-png').addEventListener('click', function() {
   map.once('postcompose', function(event) {
     var canvas = event.context.canvas;
-    canvas.toBlob(function(blob) {
-      saveAs(blob, 'map.png');
-    });
+    if (isIE()) {
+      window.navigator.msSaveBlob(canvas.msToBlob(), 'map.png');
+    } else {
+      canvas.toBlob(function(blob) {
+        saveAs(blob, 'map.png');
+      });
+    }
   });
   map.renderSync();
 });
+
+function isIE() {
+  var sAgent = window.navigator.userAgent;
+  var Idx = sAgent.indexOf('MSIE');
+  // If IE, return true.
+  if (Idx > 0)
+    return true;
+  // If IE 11 then look for Updated user agent string.
+  else if (navigator.userAgent.match(/Trident\/7\./))
+    return true;
+  else
+    return false;
+}