Make it clear a DocumentNameCollection can only contain HTMLElements

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 467cc7c3e1ef6840d449eaffa100f866bac7cfd6..967b448e6d1aa229b55c70e0851d34dea3ed5770 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -4611,7 +4611,7 @@ PassRefPtrWillBeRawPtr<HTMLCollection> Document::windowNamedItems(const AtomicSt
     return ensureCachedCollection<WindowNameCollection>(WindowNamedItems, name);
 }
 
-PassRefPtrWillBeRawPtr<HTMLCollection> Document::documentNamedItems(const AtomicString& name)
+PassRefPtrWillBeRawPtr<DocumentNameCollection> Document::documentNamedItems(const AtomicString& name)
 {
     return ensureCachedCollection<DocumentNameCollection>(DocumentNamedItems, name);
 }