Document::hoverNode() is always an Element.

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
@@ skipping 1787 matching lines @@
     }
 
     if (ElementShadow* shadow = data->shadow())
       shadow->detach(context);
   }
 
   ContainerNode::detachLayoutTree(context);
 
   if (!context.performingReattach && isUserActionElement()) {
     if (isHovered())
-      document().hoveredNodeDetached(*this);
+      document().hoveredElementDetached(*this);
     if (inActiveChain())
       document().activeChainNodeDetached(*this);
     document().userActionElements().didDetach(*this);
   }
 
   if (context.clearInvalidation)
     document().styleEngine().styleInvalidator().clearInvalidation(*this);
 
   setNeedsResizeObserverUpdate();
 
@@ skipping 2470 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(Element) {
   if (hasRareData()) {
     visitor->traceWrappers(elementRareData());
   }
   ContainerNode::traceWrappers(visitor);
 }
 
 }  // namespace blink