Implement DOM: prepend, append, before, after & replaceWith

Source/core/dom/ParentNode.idl

 /*
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 
 [
     LegacyTreatAsPartialInterface,
     NoInterfaceObject, // Always used on target of 'implements'
 ] interface ParentNode {
     [SameObject, PerWorldBindings] readonly attribute HTMLCollection children;
     [PerWorldBindings] readonly attribute Element? firstElementChild;
     [PerWorldBindings] readonly attribute Element? lastElementChild;
     readonly attribute unsigned long childElementCount;
 
-    // [Unscopeable] void prepend((Node or DOMString)... nodes);
-    // [Unscopeable] void append((Node or DOMString)... nodes);
+    [Unscopeable, RaisesException, CustomElementCallbacks, RuntimeEnabled=DOMConvenienceAPI] void prepend((Node or DOMString)... nodes);
+    [Unscopeable, RaisesException, CustomElementCallbacks, RuntimeEnabled=DOMConvenienceAPI] void append((Node or DOMString)... nodes);
 
     // [Unscopeable] Element? query(DOMString relativeSelectors);
     // [NewObject, Unscopeable] Elements queryAll(DOMString relativeSelectors);
     [RaisesException] Element? querySelector(DOMString selectors);
     [NewObject, RaisesException] NodeList querySelectorAll(DOMString selectors);
 };