diff --git a/src/components/script/dom/document.rs b/src/components/script/dom/document.rs
index a00a12c26de..497a739e172 100644
--- a/src/components/script/dom/document.rs
+++ b/src/components/script/dom/document.rs
@@ -328,6 +328,7 @@ pub trait DocumentMethods {
     fn Applets(&self) -> Temporary<HTMLCollection>;
     fn Location(&self) -> Temporary<Location>;
     fn Children(&self) -> Temporary<HTMLCollection>;
+    fn QuerySelector(&self, selectors: DOMString) -> Fallible<Option<Temporary<Element>>>;
     fn GetOnload(&self) -> Option<EventHandlerNonNull>;
     fn SetOnload(&mut self, listener: Option<EventHandlerNonNull>);
 }
@@ -810,6 +811,10 @@ impl<'a> DocumentMethods for JSRef<'a, Document> {
         HTMLCollection::children(&*window, NodeCast::from_ref(self))
     }
 
+    fn QuerySelector(&self, selectors: DOMString) -> Fallible<Option<Temporary<Element>>> {
+        Ok(None)
+    }
+
     fn GetOnload(&self) -> Option<EventHandlerNonNull> {
         let eventtarget: &JSRef<EventTarget> = EventTargetCast::from_ref(self);
         eventtarget.get_event_handler_common("load")
diff --git a/src/components/script/dom/documentfragment.rs b/src/components/script/dom/documentfragment.rs
index 886b1b894e1..2b3dc5afd80 100644
--- a/src/components/script/dom/documentfragment.rs
+++ b/src/components/script/dom/documentfragment.rs
@@ -7,10 +7,12 @@ use dom::bindings::codegen::Bindings::DocumentFragmentBinding;
 use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::Fallible;
 use dom::document::Document;
+use dom::element::Element;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlcollection::HTMLCollection;
 use dom::node::{DocumentFragmentNodeTypeId, Node, window_from_node};
 use dom::window::{Window, WindowMethods};
+use servo_util::str::DOMString;
 
 #[deriving(Encodable)]
 pub struct DocumentFragment {
@@ -46,6 +48,7 @@ impl DocumentFragment {
 
 pub trait DocumentFragmentMethods {
     fn Children(&self) -> Temporary<HTMLCollection>;
+    fn QuerySelector(&self, selectors: DOMString) -> Fallible<Option<Temporary<Element>>>;
 }
 
 impl<'a> DocumentFragmentMethods for JSRef<'a, DocumentFragment> {
@@ -53,4 +56,8 @@ impl<'a> DocumentFragmentMethods for JSRef<'a, DocumentFragment> {
         let window = window_from_node(self).root();
         HTMLCollection::children(&window.root_ref(), NodeCast::from_ref(self))
     }
+
+    fn QuerySelector(&self, selectors: DOMString) -> Fallible<Option<Temporary<Element>>> {
+        Ok(None)
+    }
 }
diff --git a/src/components/script/dom/element.rs b/src/components/script/dom/element.rs
index 2e300985eed..ee2245e8394 100644
--- a/src/components/script/dom/element.rs
+++ b/src/components/script/dom/element.rs
@@ -429,6 +429,7 @@ pub trait ElementMethods {
     fn GetInnerHTML(&self) -> Fallible<DOMString>;
     fn GetOuterHTML(&self) -> Fallible<DOMString>;
     fn Children(&self) -> Temporary<HTMLCollection>;
+    fn QuerySelector(&self, selectors: DOMString) -> Fallible<Option<Temporary<Element>>>;
     fn Remove(&self);
 }
 
@@ -704,6 +705,10 @@ impl<'a> ElementMethods for JSRef<'a, Element> {
         HTMLCollection::children(&*window, NodeCast::from_ref(self))
     }
 
+    fn QuerySelector(&self, selectors: DOMString) -> Fallible<Option<Temporary<Element>>> {
+        Ok(None)
+    }
+
     // http://dom.spec.whatwg.org/#dom-childnode-remove
     fn Remove(&self) {
         let node: &JSRef<Node> = NodeCast::from_ref(self);
diff --git a/src/components/script/dom/webidls/ParentNode.webidl b/src/components/script/dom/webidls/ParentNode.webidl
index 54b05fbbad9..70ab892fea8 100644
--- a/src/components/script/dom/webidls/ParentNode.webidl
+++ b/src/components/script/dom/webidls/ParentNode.webidl
@@ -22,4 +22,10 @@ interface ParentNode {
   // Not implemented yet
   // void prepend((Node or DOMString)... nodes);
   // void append((Node or DOMString)... nodes);
+
+  //Element? query(DOMString relativeSelectors);
+  //[NewObject] Elements queryAll(DOMString relativeSelectors);
+  [Throws]
+  Element? querySelector(DOMString selectors);
+  //[NewObject] NodeList querySelectorAll(DOMString selectors);
 };