2 files changed, 8 insertions, 1 deletions
diff --git a/src/components/script/dom/htmlselectelement.rs b/src/components/script/dom/htmlselectelement.rs
index 48f99586b85..e7d005405df 100644
--- a/src/components/script/dom/htmlselectelement.rs
+++ b/src/components/script/dom/htmlselectelement.rs
@@ -4,6 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLSelectElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLSelectElementDerived;
+use dom::bindings::codegen::UnionTypes::{HTMLElementOrLong, HTMLOptionElementOrHTMLOptGroupElement};
 use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLSelectElementTypeId;
@@ -39,6 +40,7 @@ impl HTMLSelectElement {
 
 pub trait HTMLSelectElementMethods {
     fn Validity(&self) -> Temporary<ValidityState>;
+    fn Add(&self, _element: HTMLOptionElementOrHTMLOptGroupElement, _before: Option<HTMLElementOrLong>);
 }
 
 impl<'a> HTMLSelectElementMethods for JSRef<'a, HTMLSelectElement> {
@@ -46,4 +48,8 @@ impl<'a> HTMLSelectElementMethods for JSRef<'a, HTMLSelectElement> {
         let window = window_from_node(self).root();
         ValidityState::new(&*window)
     }
+
+    // Note: this function currently only exists for test_union.html.
+    fn Add(&self, _element: HTMLOptionElementOrHTMLOptGroupElement, _before: Option<HTMLElementOrLong>) {
+    }
 }
diff --git a/src/components/script/dom/webidls/HTMLSelectElement.webidl b/src/components/script/dom/webidls/HTMLSelectElement.webidl
index 972a8950ec0..0dec2171609 100644
--- a/src/components/script/dom/webidls/HTMLSelectElement.webidl
+++ b/src/components/script/dom/webidls/HTMLSelectElement.webidl
@@ -19,7 +19,8 @@ interface HTMLSelectElement : HTMLElement {
   //         attribute unsigned long length;
   //getter Element? item(unsigned long index);
   //HTMLOptionElement? namedItem(DOMString name);
-  //void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  // Note: this function currently only exists for test_union.html.
+  void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
   //void remove(); // ChildNode overload
   //void remove(long index);
   //setter creator void (unsigned long index, HTMLOptionElement? option);