1 files changed, 6 insertions, 0 deletions
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index 3f1a25504..4ccc1aa25 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -2762,6 +2762,12 @@ public:
   static bool
   IsWebComponentsEnabled() { return sIsWebComponentsEnabled; }
 
+  /**
+   * Walks up the tree from aElement until it finds an element that is
+   * not native anonymous content.  aElement must be NAC itself.
+   */
+  static Element* GetClosestNonNativeAnonymousAncestor(Element* aElement);
+
   static bool
   IsCustomElementsEnabled() { return sIsCustomElementsEnabled; }