diff --git a/src/components/script/dom/document.rs b/src/components/script/dom/document.rs
index f699c859d74..d6165b7b85e 100644
--- a/src/components/script/dom/document.rs
+++ b/src/components/script/dom/document.rs
@@ -223,16 +223,6 @@ impl Document {
         self.createHTMLCollection(|elem| elem.tag_name == tag)
     }
 
-    // http://dom.spec.whatwg.org/#dom-document-getelementsbytagnamens
-    pub fn GetElementsByTagNameNS(&self, _ns: Option<DOMString>, _tag: DOMString) -> JS<HTMLCollection> {
-        HTMLCollection::new(&self.window, ~[])
-    }
-
-    // http://dom.spec.whatwg.org/#dom-document-getelementsbyclassname
-    pub fn GetElementsByClassName(&self, _class: DOMString) -> JS<HTMLCollection> {
-        HTMLCollection::new(&self.window, ~[])
-    }
-
     // http://dom.spec.whatwg.org/#dom-nonelementparentnode-getelementbyid
     pub fn GetElementById(&self, id: DOMString) -> Option<JS<Element>> {
         // TODO: "in tree order, within the context object's tree"
diff --git a/src/components/script/dom/webidls/Document.webidl b/src/components/script/dom/webidls/Document.webidl
index 12769016f38..feb312c559d 100644
--- a/src/components/script/dom/webidls/Document.webidl
+++ b/src/components/script/dom/webidls/Document.webidl
@@ -21,8 +21,6 @@ interface Document : Node {
   readonly attribute DocumentType? doctype;
   readonly attribute Element? documentElement;
   HTMLCollection getElementsByTagName(DOMString localName);
-  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
-  HTMLCollection getElementsByClassName(DOMString classNames);
   Element? getElementById(DOMString elementId);
 
   [Creator, Throws]