Preview upd

docs/preview/preview.html

@@ -27,6 +27,7 @@
             <label>Show skeleton <input type="checkbox" id="show_skeleton"></label>
             <label>Skeleton nodes <select id="skeleton" disabled><option value="*">All</option></select></label>
         </fieldset>
+        <label>Shadow <input type="checkbox" id="shadow" checked></label>
     </div>
 </div>
 <script src="dist/main.js"></script>