1 files changed, 11 insertions, 0 deletions
diff --git a/dom/base/ElementInlines.h b/dom/base/ElementInlines.h
index c68bd012e..df2cc2e24 100644
--- a/dom/base/ElementInlines.h
+++ b/dom/base/ElementInlines.h
@@ -25,6 +25,17 @@ Element::UnregisterActivityObserver()
   OwnerDoc()->UnregisterActivityObserver(this);
 }
 
+inline Element*
+Element::GetFlattenedTreeParentElementForStyle() const
+{
+  nsINode* parentNode = GetFlattenedTreeParentNodeForStyle();
+  if MOZ_LIKELY(parentNode && parentNode->IsElement()) {
+    return parentNode->AsElement();
+  }
+
+  return nullptr;
+}
+
 } // namespace dom
 } // namespace mozilla