Labels are a live list in tree order

1 files changed, 3 insertions, 3 deletions

diff --git a/components/script/dom/htmloutputelement.rs b/components/script/dom/htmloutputelement.rs
index 65b9ae554c8..9314672d3d0 100644
--- a/components/script/dom/htmloutputelement.rs
+++ b/components/script/dom/htmloutputelement.rs
@@ -22,6 +22,7 @@ use html5ever::{LocalName, Prefix};
 pub struct HTMLOutputElement {
     htmlelement: HTMLElement,
     form_owner: MutNullableDom<HTMLFormElement>,
+    labels_node_list: MutNullableDom<NodeList>,
 }
 
 impl HTMLOutputElement {
@@ -33,6 +34,7 @@ impl HTMLOutputElement {
         HTMLOutputElement {
             htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
             form_owner: Default::default(),
+            labels_node_list: Default::default(),
         }
     }
 
@@ -65,9 +67,7 @@ impl HTMLOutputElementMethods for HTMLOutputElement {
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-lfe-labels
-    fn Labels(&self) -> DomRoot<NodeList> {
-        self.upcast::<HTMLElement>().labels()
-    }
+    make_labels_getter!(Labels, labels_node_list);
 }
 
 impl VirtualMethods for HTMLOutputElement {