Fix "a serious bug" in the `bind_to_tree` functions

2 files changed, 9 insertions, 3 deletions

diff --git a/components/script/dom/htmlheadelement.rs b/components/script/dom/htmlheadelement.rs
index 419644c5bb3..fc6e888d015 100644
--- a/components/script/dom/htmlheadelement.rs
+++ b/components/script/dom/htmlheadelement.rs
@@ -71,7 +71,10 @@ impl VirtualMethods for HTMLHeadElement {
     fn super_type(&self) -> Option<&VirtualMethods> {
         Some(self.upcast::<HTMLElement>() as &VirtualMethods)
     }
-    fn bind_to_tree(&self, _tree_in_doc: bool) {
+    fn bind_to_tree(&self, tree_in_doc: bool) {
+        if let Some(ref s) = self.super_type() {
+            s.bind_to_tree(tree_in_doc);
+        }
         load_script(self);
     }
 }
diff --git a/components/script/dom/htmltitleelement.rs b/components/script/dom/htmltitleelement.rs
index c124a4a3604..f3ec357cb56 100644
--- a/components/script/dom/htmltitleelement.rs
+++ b/components/script/dom/htmltitleelement.rs
@@ -71,9 +71,12 @@ impl VirtualMethods for HTMLTitleElement {
         }
     }
 
-    fn bind_to_tree(&self, is_in_doc: bool) {
+    fn bind_to_tree(&self, tree_in_doc: bool) {
+        if let Some(ref s) = self.super_type() {
+            s.bind_to_tree(tree_in_doc);
+        }
         let node = self.upcast::<Node>();
-        if is_in_doc {
+        if tree_in_doc {
             node.owner_doc().title_changed();
         }
     }