diff --git a/components/script/dom/namednodemap.rs b/components/script/dom/namednodemap.rs
index bfa8f1652f1..239fff86fbb 100644
--- a/components/script/dom/namednodemap.rs
+++ b/components/script/dom/namednodemap.rs
@@ -8,8 +8,12 @@ use dom::bindings::codegen::Bindings::NamedNodeMapBinding::NamedNodeMapMethods;
 use dom::bindings::global::GlobalRef;
 use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflector, reflect_dom_object};
-use dom::element::{Element, ElementHelpers};
+use dom::element::{AttributeHandlers, Element, ElementHelpers};
 use dom::window::Window;
+use util::namespace;
+use util::str::DOMString;
+
+use string_cache::Atom;
 
 #[dom_struct]
 pub struct NamedNodeMap {
@@ -32,6 +36,7 @@ impl NamedNodeMap {
 }
 
 impl<'a> NamedNodeMapMethods for JSRef<'a, NamedNodeMap> {
+    // https://dom.spec.whatwg.org/#dom-namednodemap-length
     fn Length(self) -> u32 {
         let owner = self.owner.root();
         // FIXME(https://github.com/rust-lang/rust/issues/23338)
@@ -40,6 +45,7 @@ impl<'a> NamedNodeMapMethods for JSRef<'a, NamedNodeMap> {
         attrs.len() as u32
     }
 
+    // https://dom.spec.whatwg.org/#dom-namednodemap-item
     fn Item(self, index: u32) -> Option<Temporary<Attr>> {
         let owner = self.owner.root();
         // FIXME(https://github.com/rust-lang/rust/issues/23338)
@@ -48,10 +54,34 @@ impl<'a> NamedNodeMapMethods for JSRef<'a, NamedNodeMap> {
         attrs.as_slice().get(index as usize).map(|x| Temporary::new(x.clone()))
     }
 
+    // https://dom.spec.whatwg.org/#dom-namednodemap-getnameditem
+    fn GetNamedItem(self, name: DOMString) -> Option<Temporary<Attr>> {
+        let owner = self.owner.root();
+        // FIXME(https://github.com/rust-lang/rust/issues/23338)
+        let owner = owner.r();
+        let name = owner.parsed_name(name);
+        owner.get_attribute_by_name(&Atom::from_slice(&name))
+    }
+
+    // https://dom.spec.whatwg.org/#dom-namednodemap-getnameditemns
+    fn GetNamedItemNS(self, namespace: Option<DOMString>, name: DOMString) -> Option<Temporary<Attr>> {
+        let owner = self.owner.root();
+        // FIXME(https://github.com/rust-lang/rust/issues/23338)
+        let owner = owner.r();
+        let ns = namespace::from_domstring(namespace);
+        owner.get_attribute(&ns, &Atom::from_slice(&name))
+    }
+
     fn IndexedGetter(self, index: u32, found: &mut bool) -> Option<Temporary<Attr>> {
         let item = self.Item(index);
         *found = item.is_some();
         item
     }
+
+    fn NamedGetter(self, name: DOMString, found: &mut bool) -> Option<Temporary<Attr>> {
+        let item = self.GetNamedItem(name);
+        *found = item.is_some();
+        item
+    }
 }
 
diff --git a/components/script/dom/webidls/NamedNodeMap.webidl b/components/script/dom/webidls/NamedNodeMap.webidl
index 9279af57de5..f15151b8ce9 100644
--- a/components/script/dom/webidls/NamedNodeMap.webidl
+++ b/components/script/dom/webidls/NamedNodeMap.webidl
@@ -5,8 +5,8 @@
 interface NamedNodeMap {
   readonly attribute unsigned long length;
   getter Attr? item(unsigned long index);
-  //getter Attr? getNamedItem(DOMString name);
-  //Attr? getNamedItemNS(DOMString? namespace, DOMString localName);
+  getter Attr? getNamedItem(DOMString name);
+  Attr? getNamedItemNS(DOMString? namespace, DOMString localName);
   //[Throws]
   //Attr? setNamedItem(Attr attr);
   //[Throws]
diff --git a/tests/wpt/metadata/dom/interfaces.html.ini b/tests/wpt/metadata/dom/interfaces.html.ini
index 5c7e946e5d1..c3913ed9046 100644
--- a/tests/wpt/metadata/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/dom/interfaces.html.ini
@@ -384,12 +384,6 @@
   [Element interface: calling after([object Object\],[object Object\]) on element with too few arguments must throw TypeError]
     expected: FAIL
 
-  [NamedNodeMap interface: operation getNamedItem(DOMString)]
-    expected: FAIL
-
-  [NamedNodeMap interface: operation getNamedItemNS(DOMString,DOMString)]
-    expected: FAIL
-
   [NamedNodeMap interface: operation setNamedItem(Attr)]
     expected: FAIL