Some magic to make test work

js/js.libraries/src/core/dom.kt

@@ -1,27 +1,33 @@
 package org.w3c.dom
 
+import js.noImpl
+
 /**
  * A stub class definition so we can work with the DOM APIs as native objects
  */
-native public interface Document : Node {
+native public trait Document : Node {
+    fun getElementById(id : String) : Element = js.noImpl
+    fun createTextNode(text : String) : Node = js.noImpl
 }
 
-native public interface Attr : Node {}
-native public interface CDATASection : Text {}
-native public interface CharacterData : Node {}
-native public interface Comment : CharacterData {}
-native public interface DOMImplementation {}
-native public interface DocumentType : Node {}
-native public interface Element : Node {}
-native public interface Entity : Node {}
-native public interface EntityReference : Node {}
-native public interface NameList {}
-native public interface NamedNodeMap {}
-native public interface Node {}
-native public interface NodeList {}
-native public interface Notation : Node {}
-native public interface ProcessingInstruction : Node {}
-native public interface Text : CharacterData {}
-native public interface TypeInfo {}
-native public interface UserDataHandler {}
+native public trait Attr : Node {}
+native public trait CDATASection : Text {}
+native public trait CharacterData : Node {}
+native public trait Comment : CharacterData {}
+native public trait DOMImplementation {}
+native public trait DocumentType : Node {}
+native public trait Element : Node {
+    fun appendChild(child : Node) : Unit = js.noImpl
+}
+native public trait Entity : Node {}
+native public trait EntityReference : Node {}
+native public trait NameList {}
+native public trait NamedNodeMap {}
+native public trait Node {}
+native public trait NodeList {}
+native public trait Notation : Node {}
+native public trait ProcessingInstruction : Node {}
+native public trait Text : CharacterData {}
+native public trait TypeInfo {}
+native public trait UserDataHandler {}
 

js/js.libraries/src/stdlib/browser.kt

@@ -1,8 +1,8 @@
 package kotlin.browser
 
-import org.w3c.dom.Document
 import js.native
 import js.library
+import org.w3c.dom.Document
 
 /**
  * Provides access to the current active browsers DOM for the currently visible page.