Text API does not behave according to specification

Source/core/dom/Text.idl

Index: Source/core/dom/Text.idl
diff --git a/Source/core/dom/Text.idl b/Source/core/dom/Text.idl
index 8ed5b8d2c5120b77307b8082776753cfc5850d9f..aa82a4110fe47020047873856e816cc42d7099af 100644
--- a/Source/core/dom/Text.idl
+++ b/Source/core/dom/Text.idl
@@ -23,10 +23,9 @@
 ] interface Text : CharacterData {
 
     // DOM Level 1
-
-    [RaisesException] Text splitText([IsIndex,Default=Undefined] optional unsigned long offset);
+    [RaisesException] Text splitText(unsigned long offset);
 
     // Introduced in DOM Level 3:
     readonly attribute DOMString       wholeText;
-    Text                               replaceWholeText([Default=Undefined] optional DOMString content);
+    Text                               replaceWholeText(DOMString content); // Removed from DOM4.
 };