Fix Element::GetAttribute()

Local names should not be used to get a attribute without providing a namespace.

components/script/dom/element.rs

@@ -610,6 +610,9 @@ pub trait AttributeHandlers {
     /// name, if any.
     fn get_attribute(self, namespace: Namespace, local_name: &Atom)
                      -> Option<Temporary<Attr>>;
+    /// Returns the first attribute with any namespace and given case-sensitive
+    /// name, if any.
+    fn get_attribute_by_name(self, name: &Atom) -> Option<Temporary<Attr>>;
     fn get_attributes(self, local_name: &Atom)
                       -> Vec<Temporary<Attr>>;
     fn set_attribute_from_parser(self,
@@ -651,6 +654,15 @@ impl<'a> AttributeHandlers for JSRef<'a, Element> {
             .map(|x| Temporary::from_rooted(x.r()))
     }
 
+    fn get_attribute_by_name(self, name: &Atom) -> Option<Temporary<Attr>> {
+        // FIXME(https://github.com/rust-lang/rust/issues/23338)
+        let attrs = self.attrs.borrow();
+        attrs.iter().map(|attr| attr.root())
+             .find(|a| a.r().name() == name)
+             .map(|x| Temporary::from_rooted(x.r()))
+    }
+
+    // https://dom.spec.whatwg.org/#concept-element-attributes-get-by-name
     fn get_attributes(self, local_name: &Atom) -> Vec<Temporary<Attr>> {
         // FIXME(https://github.com/rust-lang/rust/issues/23338)
         let attrs = self.attrs.borrow();
@@ -974,7 +986,7 @@ impl<'a> ElementMethods for JSRef<'a, Element> {
     // http://dom.spec.whatwg.org/#dom-element-getattribute
     fn GetAttribute(self, name: DOMString) -> Option<DOMString> {
         let name = self.parsed_name(name);
-        self.get_attribute(ns!(""), &Atom::from_slice(&name)).root()
+        self.get_attribute_by_name(&Atom::from_slice(&name)).root()
                      .map(|s| s.r().Value())
     }
 

tests/wpt/metadata/dom/nodes/attributes.html.ini

@@ -1,17 +1,8 @@
 [attributes.html]
   type: testharness
-  [setAttribute should set the attribute with the given qualified name]
-    expected: FAIL
-
   [When qualifiedName does not match the QName production, an NAMESPACE_ERR exception is to be thrown.]
     expected: FAIL
 
-  [First set attribute is returned by getAttribute]
-    expected: FAIL
-
-  [First set attribute is returned with mapped attribute set later]
-    expected: FAIL
-
   [Attribute with prefix in local name]
     expected: FAIL