added back polyfills for older browsers

src/common/layer.js

@@ -17,9 +17,9 @@ const $ = jQuery;
  * an existing group element or, with three parameters, will create a new layer group element.
  *
  * @example
- * const l1 = new Layer('name', group);          // Use the existing group for this layer.
+ * const l1 = new Layer('name', group); // Use the existing group for this layer.
  * const l2 = new Layer('name', group, svgElem); // Create a new group and add it to the DOM after group.
- * const l3 = new Layer('name', null, svgElem);  // Create a new group and add it to the DOM as the last layer.
+ * const l3 = new Layer('name', null, svgElem); // Create a new group and add it to the DOM as the last layer.
  * @memberof module:layer
  */
 class Layer {

src/editor/embedapi.js

@@ -105,11 +105,11 @@ svgCanvas.setSvgString('string');
 
 // Or if a callback is needed:
 svgCanvas.setSvgString('string')(function (data, error) {
-  if (error) {
+     if (error) {
      // There was an error
-  } else {
+     } else {
      // Handle data
-  }
+     }
 });
 
 // Everything is done with the same API as the real svg-edit,

src/editor/spinbtn/jQuery.SpinButton.js

@@ -65,8 +65,8 @@
   };
 
   $(function () {
-    // Initialise INPUT element(s) as SpinButtons: (passing options if desired)
-    $('#myInputElement').SpinButton(myOptions);
+     // Initialise INPUT element(s) as SpinButtons: (passing options if desired)
+     $('#myInputElement').SpinButton(myOptions);
   });
  */
 /**