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

Source/core/dom/ParentNode.idl

Index: Source/core/dom/ParentNode.idl
diff --git a/Source/core/dom/ParentNode.idl b/Source/core/dom/ParentNode.idl
index e660f6c33f04458ec92704375e453308d81ea266..0f722e86b67d0f737e99a090b50e82f9c0818043 100644
--- a/Source/core/dom/ParentNode.idl
+++ b/Source/core/dom/ParentNode.idl
@@ -39,8 +39,8 @@
     [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);