Bug 1455674 part 16. Remove most use of nsIDOMElement in dom. r=qdot

dom/base/Element.cpp

@@ -6,7 +6,7 @@
 
 /*
  * Base class for all element classes; this provides an implementation
- * of DOM Core's nsIDOMElement, implements nsIContent, provides
+ * of DOM Core's Element, implements nsIContent, provides
  * utility methods for subclasses, and so forth.
  */
 

dom/base/Element.h

@@ -6,7 +6,7 @@
 
 /*
  * Base class for all element classes; this provides an implementation
- * of DOM Core's nsIDOMElement, implements nsIContent, provides
+ * of DOM Core's Element, implements nsIContent, provides
  * utility methods for subclasses, and so forth.
  */
 
@@ -18,7 +18,6 @@
 #include "mozilla/EventStates.h"           // for member
 #include "mozilla/ServoTypes.h"
 #include "mozilla/dom/DirectionalityUtils.h"
-#include "nsIDOMElement.h"
 #include "nsILinkHandler.h"
 #include "nsINodeList.h"
 #include "nsNodeUtils.h"

dom/base/FragmentOrElement.cpp

@@ -5,9 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /*
- * Base class for all element classes; this provides an implementation
- * of DOM Core's nsIDOMElement, implements nsIContent, provides
- * utility methods for subclasses, and so forth.
+ * Base class for all element classes and DocumentFragment.
  */
 
 #include "mozilla/ArrayUtils.h"

dom/base/FragmentOrElement.h

@@ -70,8 +70,8 @@ private:
 };
 
 /**
- * A generic base class for DOM elements, implementing many nsIContent,
- * nsIDOMNode and nsIDOMElement methods.
+ * A generic base class for DOM elements and document fragments,
+ * implementing many nsIContent, nsIDOMNode and Element methods.
  */
 namespace mozilla {
 namespace dom {

dom/base/IDTracker.cpp

@@ -13,7 +13,6 @@
 #include "nsEscape.h"
 #include "nsXBLPrototypeBinding.h"
 #include "nsIDOMNode.h"
-#include "nsIDOMElement.h"
 #include "nsCycleCollectionParticipant.h"
 
 namespace mozilla {

dom/base/nsContentPermissionHelper.cpp

@@ -6,7 +6,6 @@
 
 #include <map>
 #include "nsCOMPtr.h"
-#include "nsIDOMElement.h"
 #include "nsIPrincipal.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/dom/ContentParent.h"

dom/base/nsContentPolicy.cpp

@@ -17,7 +17,6 @@
 #include "nsContentPolicy.h"
 #include "nsIURI.h"
 #include "nsIDocShell.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMNode.h"
 #include "nsIDOMWindow.h"
 #include "nsITabChild.h"

dom/base/nsContentUtils.cpp

@@ -134,7 +134,6 @@
 #include "nsIDocumentEncoder.h"
 #include "nsIDOMChromeWindow.h"
 #include "nsIDOMDocument.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMNode.h"
 #include "nsIDOMWindowUtils.h"
 #include "nsIDragService.h"

dom/base/nsCopySupport.cpp

@@ -32,7 +32,6 @@
 #include "nsPIDOMWindow.h"
 #include "nsIDocument.h"
 #include "nsIDOMNode.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMDocument.h"
 #include "nsIHTMLDocument.h"
 #include "nsGkAtoms.h"

dom/base/nsDocument.cpp

@@ -113,7 +113,6 @@
 
 #include "nsIDOMWindow.h"
 #include "nsPIDOMWindow.h"
-#include "nsIDOMElement.h"
 #include "nsFocusManager.h"
 
 // for radio group stuff

dom/base/nsDocumentEncoder.cpp

@@ -20,7 +20,6 @@
 #include "nsIContentSerializer.h"
 #include "mozilla/Encoding.h"
 #include "nsIOutputStream.h"
-#include "nsIDOMElement.h"
 #include "nsRange.h"
 #include "nsIDOMDocument.h"
 #include "nsGkAtoms.h"

dom/base/nsFocusManager.cpp

@@ -18,7 +18,6 @@
 #include "nsIContentParent.h"
 #include "nsPIDOMWindow.h"
 #include "nsIDOMChromeWindow.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMRange.h"
 #include "nsIHTMLDocument.h"

dom/base/nsFocusManager.h

@@ -64,7 +64,7 @@ public:
 
   /**
    * A faster version of nsIFocusManager::GetFocusedElement, returning a
-   * raw Element pointer (instead of having AddRef-ed nsIDOMElement
+   * raw Element pointer (instead of having AddRef-ed Element
    * pointer filled in to an out-parameter).
    */
   mozilla::dom::Element* GetFocusedElement() { return mFocusedElement; }

dom/base/nsGlobalWindowCommands.cpp

@@ -8,7 +8,6 @@
 #include "nsGlobalWindowCommands.h"
 
 #include "nsIComponentManager.h"
-#include "nsIDOMElement.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsCRT.h"

dom/base/nsGlobalWindowInner.cpp

@@ -111,7 +111,6 @@
 #include "nsIDocument.h"
 #include "Crypto.h"
 #include "nsIDOMDocument.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMOfflineResourceList.h"
 #include "nsDOMString.h"
 #include "nsIEmbeddingSiteWindow.h"
@@ -4974,28 +4973,6 @@ nsGlobalWindowInner::GetDefaultComputedStyle(Element& aElt,
   return GetComputedStyleHelper(aElt, aPseudoElt, true, aError);
 }
 
-nsresult
-nsGlobalWindowInner::GetComputedStyleHelper(nsIDOMElement* aElt,
-                                            const nsAString& aPseudoElt,
-                                            bool aDefaultStylesOnly,
-                                            nsICSSDeclaration** aReturn)
-{
-  NS_ENSURE_ARG_POINTER(aReturn);
-  *aReturn = nullptr;
-
-  nsCOMPtr<dom::Element> element = do_QueryInterface(aElt);
-  if (!element) {
-    return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
-  }
-
-  ErrorResult rv;
-  nsCOMPtr<nsICSSDeclaration> cs =
-    GetComputedStyleHelper(*element, aPseudoElt, aDefaultStylesOnly, rv);
-  cs.forget(aReturn);
-
-  return rv.StealNSResult();
-}
-
 already_AddRefed<nsICSSDeclaration>
 nsGlobalWindowInner::GetComputedStyleHelper(Element& aElt,
                                             const nsAString& aPseudoElt,

dom/base/nsGlobalWindowInner.h

@@ -1241,10 +1241,6 @@ protected:
                            const nsAString& aPseudoElt,
                            bool aDefaultStylesOnly,
                            mozilla::ErrorResult& aError);
-  nsresult GetComputedStyleHelper(nsIDOMElement* aElt,
-                                  const nsAString& aPseudoElt,
-                                  bool aDefaultStylesOnly,
-                                  nsICSSDeclaration** aReturn);
 
   nsGlobalWindowInner* InnerForSetTimeoutOrInterval(mozilla::ErrorResult& aError);
 

dom/base/nsGlobalWindowOuter.cpp

@@ -108,7 +108,6 @@
 #include "nsIDocument.h"
 #include "Crypto.h"
 #include "nsIDOMDocument.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMOfflineResourceList.h"
 #include "nsDOMString.h"
 #include "nsIEmbeddingSiteWindow.h"

dom/base/nsHTMLContentSerializer.cpp

@@ -12,7 +12,6 @@
 
 #include "nsHTMLContentSerializer.h"
 
-#include "nsIDOMElement.h"
 #include "nsIContent.h"
 #include "nsIDocument.h"
 #include "nsElementTable.h"

dom/base/nsIDocument.h

@@ -94,7 +94,6 @@ class nsIDocShellTreeItem;
 class nsIDocumentEncoder;
 class nsIDocumentObserver;
 class nsIDOMDocument;
-class nsIDOMElement;
 class nsIHTMLCollection;
 class nsILayoutHistoryState;
 class nsILoadContext;

dom/base/nsINode.h

@@ -42,7 +42,6 @@ class nsDOMAttributeMap;
 class nsIAnimationObserver;
 class nsIContent;
 class nsIDocument;
-class nsIDOMElement;
 class nsIFrame;
 class nsIMutationObserver;
 class nsINode;

dom/base/nsInProcessTabChildGlobal.h

@@ -17,7 +17,6 @@
 #include "nsIScriptContext.h"
 #include "nsIClassInfo.h"
 #include "nsIDocShell.h"
-#include "nsIDOMElement.h"
 #include "nsCOMArray.h"
 #include "nsIRunnable.h"
 #include "nsIGlobalObject.h"

dom/base/nsXHTMLContentSerializer.cpp

@@ -12,7 +12,6 @@
 
 #include "nsXHTMLContentSerializer.h"
 
-#include "nsIDOMElement.h"
 #include "nsIContent.h"
 #include "nsIDocument.h"
 #include "nsElementTable.h"

dom/base/test/unit/test_xml_serializer.js

@@ -134,8 +134,7 @@ function test4() {
                  '<child xmlns:b="ns2" xmlns:a="ns3">'+
                  '<child2/></child></root>');
   root = doc.documentElement;
-  // Have to QI here -- no classinfo flattening in xpcshell, apparently
-  var node = root.firstChild.firstChild.QueryInterface(nsIDOMElement);
+  var node = root.firstChild.firstChild;
   node.setAttributeNS("ns4", "l1", "v1");
   node.setAttributeNS("ns4", "p2:l2", "v2");
   node.setAttributeNS("", "l3", "v3");
@@ -251,8 +250,7 @@ function test7() {
                  '<child1 xmlns=""><child2/></child1></root>')
   root = doc.documentElement;
 
-  // No interface flattening in xpcshell
-  var child1 = root.firstChild.QueryInterface(nsIDOMElement);
+  var child1 = root.firstChild;
   child1.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns",
                         "http://www.w3.org/1999/xhtml");
   do_check_serialize(doc);
@@ -265,9 +263,8 @@ function test7() {
                  '<child2 xmlns="http://www.w3.org/1999/xhtml"></child2>' +
                  '</child1></root>')
   root = doc.documentElement;
-  // No interface flattening in xpcshell
-  child1 = root.firstChild.QueryInterface(nsIDOMElement);
-  var child2 = child1.firstChild.QueryInterface(nsIDOMElement);
+  child1 = root.firstChild;
+  var child2 = child1.firstChild;
   child1.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns",
                         "http://www.w3.org/1999/xhtml");
   child2.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns", "");

dom/events/DataTransfer.h

@@ -11,7 +11,6 @@
 #include "nsTArray.h"
 #include "nsIVariant.h"
 #include "nsIPrincipal.h"
-#include "nsIDOMElement.h"
 #include "nsIDragService.h"
 #include "nsCycleCollectionParticipant.h"
 

dom/events/EventStateManager.cpp

@@ -3353,13 +3353,10 @@ EventStateManager::PostHandleEvent(nsPresContext* aPresContext,
         }
 
         if (activeContent) {
-          // The nearest enclosing element goes into the
-          // :active state.  If we fail the QI to DOMElement,
-          // then we know we're only a node, and that we need
-          // to obtain our parent element and put it into :active
-          // instead.
-          nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(activeContent));
-          if (!elt) {
+          // The nearest enclosing element goes into the :active state.  If
+          // we're not an element (so we're text or something) we need to obtain
+          // our parent element and put it into :active instead.
+          if (!activeContent->IsElement()) {
             nsIContent* par = activeContent->GetParent();
             if (par)
               activeContent = par;

dom/html/ImageDocument.cpp

@@ -31,7 +31,6 @@
 #include "nsIContentPolicy.h"
 #include "nsContentPolicyUtils.h"
 #include "nsPIDOMWindow.h"
-#include "nsIDOMElement.h"
 #include "nsError.h"
 #include "nsURILoader.h"
 #include "nsIDocShell.h"

dom/html/nsBrowserElement.cpp

@@ -15,7 +15,6 @@
 
 #include "nsComponentManagerUtils.h"
 #include "nsFrameLoader.h"
-#include "nsIDOMElement.h"
 #include "nsIMozBrowserFrame.h"
 #include "nsINode.h"
 #include "nsIPrincipal.h"

dom/html/nsHTMLDocument.cpp

@@ -23,7 +23,6 @@
 #include "nsIPresShell.h"
 #include "nsPresContext.h"
 #include "nsIDOMNode.h" // for Find
-#include "nsIDOMElement.h"
 #include "nsPIDOMWindow.h"
 #include "nsDOMString.h"
 #include "nsIStreamListener.h"

dom/ipc/TabParent.cpp

@@ -54,7 +54,6 @@
 #include "nsIContent.h"
 #include "nsIDocShell.h"
 #include "nsIDocShellTreeOwner.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMWindow.h"
 #include "nsIDOMWindowUtils.h"
 #include "nsIInterfaceRequestorUtils.h"

dom/plugins/base/nsJSNPRuntime.cpp

@@ -21,7 +21,6 @@
 #include "nsIDocument.h"
 #include "nsIXPConnect.h"
 #include "xpcpublic.h"
-#include "nsIDOMElement.h"
 #include "nsIContent.h"
 #include "nsPluginInstanceOwner.h"
 #include "nsWrapperCacheInlines.h"

dom/plugins/base/nsNPAPIPlugin.cpp

@@ -26,7 +26,6 @@
 #include "nsPluginsDir.h"
 #include "nsPluginLogging.h"
 
-#include "nsIDOMElement.h"
 #include "nsPIDOMWindow.h"
 #include "nsGlobalWindow.h"
 #include "nsIDocument.h"
@@ -38,7 +37,9 @@
 #include "nsIPrincipal.h"
 #include "nsWildCard.h"
 #include "nsContentUtils.h"
+#include "mozilla/dom/Element.h"
 #include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/ToJSValue.h"
 #include "nsIXULRuntime.h"
 #include "nsIXPConnect.h"
 
@@ -713,7 +714,7 @@ _getpluginelement(NPP npp)
   if (!inst)
     return nullptr;
 
-  nsCOMPtr<nsIDOMElement> element;
+  RefPtr<dom::Element> element;
   inst->GetDOMElement(getter_AddRefs(element));
 
   if (!element)
@@ -733,10 +734,16 @@ _getpluginelement(NPP npp)
   nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID()));
   NS_ENSURE_TRUE(xpc, nullptr);
 
-  JS::RootedObject obj(cx);
-  xpc->WrapNative(cx, ::JS::CurrentGlobalOrNull(cx), element,
-                  NS_GET_IID(nsIDOMElement), obj.address());
-  NS_ENSURE_TRUE(obj, nullptr);
+  JS::RootedValue val(cx);
+  if (!ToJSValue(cx, element, &val)) {
+    return nullptr;
+  }
+
+  if (NS_WARN_IF(!val.isObject())) {
+    return nullptr;
+  }
+
+  JS::RootedObject obj(cx, &val.toObject());
 
   return nsJSObjWrapper::GetNewOrUsed(npp, obj);
 }
@@ -1451,18 +1458,13 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
       return NPERR_GENERIC_ERROR;
     }
 
-    nsCOMPtr<nsIDOMElement> element;
+    RefPtr<dom::Element> element;
     inst->GetDOMElement(getter_AddRefs(element));
     if (!element) {
       return NPERR_GENERIC_ERROR;
     }
 
-    nsCOMPtr<nsIContent> content(do_QueryInterface(element));
-    if (!content) {
-      return NPERR_GENERIC_ERROR;
-    }
-
-    nsIPrincipal* principal = content->NodePrincipal();
+    nsIPrincipal* principal = element->NodePrincipal();
 
     nsAutoString utf16Origin;
     res = nsContentUtils::GetUTFOrigin(principal, utf16Origin);

dom/plugins/base/nsNPAPIPluginInstance.cpp

@@ -18,7 +18,6 @@
 #include "nsPluginInstanceOwner.h"
 
 #include "nsThreadUtils.h"
-#include "nsIDOMElement.h"
 #include "nsIDocument.h"
 #include "nsIDocShell.h"
 #include "nsIScriptGlobalObject.h"
@@ -33,6 +32,7 @@
 #include "mozilla/Preferences.h"
 #include "mozilla/Unused.h"
 #include "nsILoadContext.h"
+#include "mozilla/dom/Element.h"
 #include "mozilla/dom/HTMLObjectElementBinding.h"
 #include "AudioChannelService.h"
 
@@ -1088,7 +1088,7 @@ nsNPAPIPluginInstance::ConvertPoint(double sourceX, double sourceY, NPCoordinate
 }
 
 nsresult
-nsNPAPIPluginInstance::GetDOMElement(nsIDOMElement* *result)
+nsNPAPIPluginInstance::GetDOMElement(Element** result)
 {
   if (!mOwner) {
     *result = nullptr;

dom/plugins/base/nsNPAPIPluginInstance.h

@@ -31,6 +31,12 @@ class nsIPluginInstanceOwner;
 class nsIOutputStream;
 class nsPluginInstanceOwner;
 
+namespace mozilla {
+namespace dom {
+class Element;
+} // namespace dom
+} // namespace mozilla
+
 #if defined(OS_WIN)
 const NPDrawingModel kDefaultDrawingModel = NPDrawingModelSyncWin;
 #elif defined(MOZ_X11)
@@ -190,7 +196,7 @@ public:
 
   nsresult IsPrivateBrowsing(bool *aEnabled);
 
-  nsresult GetDOMElement(nsIDOMElement* *result);
+  nsresult GetDOMElement(mozilla::dom::Element* *result);
 
   nsNPAPITimer* TimerWithID(uint32_t id, uint32_t* index);
   uint32_t      ScheduleTimer(uint32_t interval, NPBool repeat, void (*timerFunc)(NPP npp, uint32_t timerID));

dom/plugins/base/nsPluginHost.cpp

@@ -52,6 +52,7 @@
 #include "nsPluginStreamListenerPeer.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/Element.h"
 #include "mozilla/dom/FakePluginTagInitBinding.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/LoadInfo.h"
@@ -70,7 +71,6 @@
 
 // for the dialog
 #include "nsIWindowWatcher.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMWindow.h"
 
 #include "nsNetCID.h"
@@ -3297,15 +3297,14 @@ nsresult nsPluginHost::NewPluginURLStream(const nsString& aURL,
   rv = listenerPeer->Initialize(url, aInstance, aListener);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  nsCOMPtr<nsIDOMElement> element;
+  RefPtr<dom::Element> element;
   nsCOMPtr<nsIDocument> doc;
   if (owner) {
     owner->GetDOMElement(getter_AddRefs(element));
     owner->GetDocument(getter_AddRefs(doc));
   }
 
-  nsCOMPtr<nsINode> requestingNode(do_QueryInterface(element));
-  NS_ENSURE_TRUE(requestingNode, NS_ERROR_FAILURE);
+  NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);
 
   nsCOMPtr<nsIChannel> channel;
   // @arg loadgroup:
@@ -3314,7 +3313,7 @@ nsresult nsPluginHost::NewPluginURLStream(const nsString& aURL,
   // form |nsDocShell::OnLinkClickSync| bug 166613
   rv = NS_NewChannel(getter_AddRefs(channel),
                      url,
-                     requestingNode,
+                     element,
                      nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS |
                      nsILoadInfo::SEC_FORCE_INHERIT_PRINCIPAL,
                      nsIContentPolicy::TYPE_OBJECT_SUBREQUEST,
@@ -3857,7 +3856,7 @@ nsPluginHost::PluginCrashed(nsNPAPIPlugin* aPlugin,
     if (instance->GetPlugin() == aPlugin) {
       // notify the content node (nsIObjectLoadingContent) that the
       // plugin has crashed
-      nsCOMPtr<nsIDOMElement> domElement;
+      RefPtr<dom::Element> domElement;
       instance->GetDOMElement(getter_AddRefs(domElement));
       nsCOMPtr<nsIObjectLoadingContent> objectContent(do_QueryInterface(domElement));
       if (objectContent) {
@@ -3952,7 +3951,7 @@ nsPluginHost::DestroyRunningInstances(nsPluginTag* aPluginTag)
       nsPluginTag* pluginTag = TagForPlugin(instance->GetPlugin());
       instance->SetWindow(nullptr);
 
-      nsCOMPtr<nsIDOMElement> domElement;
+      RefPtr<dom::Element> domElement;
       instance->GetDOMElement(getter_AddRefs(domElement));
       nsCOMPtr<nsIObjectLoadingContent> objectContent =
         do_QueryInterface(domElement);

dom/plugins/base/nsPluginInstanceOwner.cpp

@@ -52,6 +52,7 @@ using mozilla::DefaultXDisplay;
 #include "mozilla/MouseEvents.h"
 #include "mozilla/TextEvents.h"
 #include "mozilla/dom/DragEvent.h"
+#include "mozilla/dom/Element.h"
 #include "mozilla/dom/Event.h"
 #include "mozilla/dom/HTMLObjectElementBinding.h"
 #include "mozilla/dom/TabChild.h"
@@ -387,7 +388,7 @@ void nsPluginInstanceOwner::GetAttributes(nsTArray<MozPluginParameter>& attribut
   loadingContent->GetPluginAttributes(attributes);
 }
 
-NS_IMETHODIMP nsPluginInstanceOwner::GetDOMElement(nsIDOMElement* *result)
+NS_IMETHODIMP nsPluginInstanceOwner::GetDOMElement(Element** result)
 {
   return CallQueryReferent(mContent.get(), result);
 }

dom/plugins/base/nsPluginInstanceOwner.h

@@ -37,6 +37,7 @@ class gfxContext;
 namespace mozilla {
 class TextComposition;
 namespace dom {
+class Element;
 class Event;
 struct MozPluginParameter;
 } // namespace dom
@@ -95,7 +96,7 @@ public:
    * @param aDOMElement - resulting DOM element
    * @result - NS_OK if this operation was successful
    */
-  NS_IMETHOD GetDOMElement(nsIDOMElement* * aResult);
+  NS_IMETHOD GetDOMElement(mozilla::dom::Element** aResult);
 
   // nsIDOMEventListener interfaces
   NS_DECL_NSIDOMEVENTLISTENER

dom/plugins/base/nsPluginStreamListenerPeer.cpp

@@ -6,7 +6,6 @@
 #include "nsPluginStreamListenerPeer.h"
 #include "nsIContentPolicy.h"
 #include "nsContentPolicyUtils.h"
-#include "nsIDOMElement.h"
 #include "nsIStreamConverterService.h"
 #include "nsIStreamLoader.h"
 #include "nsIHttpChannel.h"

dom/plugins/ipc/PluginInstanceParent.cpp

@@ -26,7 +26,6 @@
 #include "nsNPAPIPluginInstance.h"
 #include "nsPluginInstanceOwner.h"
 #include "nsFocusManager.h"
-#include "nsIDOMElement.h"
 #ifdef MOZ_X11
 #include "gfxXlibSurface.h"
 #endif
@@ -2222,11 +2221,10 @@ PluginInstanceParent::AnswerPluginFocusChange(const bool& gotFocus)
       nsPluginInstanceOwner* owner = GetOwner();
       if (owner) {
         nsIFocusManager* fm = nsFocusManager::GetFocusManager();
-        nsCOMPtr<nsIDOMElement> element;
+        RefPtr<dom::Element> element;
         owner->GetDOMElement(getter_AddRefs(element));
         if (fm && element) {
-          nsCOMPtr<dom::Element> domElement(do_QueryInterface(element));
-          fm->SetFocus(domElement, 0);
+          fm->SetFocus(element, 0);
         }
       }
     }

dom/plugins/ipc/PluginModuleParent.cpp

@@ -13,6 +13,7 @@
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/ipc/CrashReporterClient.h"
 #include "mozilla/ipc/CrashReporterHost.h"
+#include "mozilla/dom/Element.h"
 #include "mozilla/ipc/GeckoChildProcessHost.h"
 #include "mozilla/ipc/MessageChannel.h"
 #include "mozilla/ipc/ProtocolUtils.h"
@@ -2472,10 +2473,10 @@ PluginModuleParent::NPP_NewInternal(NPMIMEType pluginType, NPP instance,
     // Any IPC messages for the PluginInstance actor should be dispatched to the
     // DocGroup for the plugin's document.
     RefPtr<nsPluginInstanceOwner> owner = parentInstance->GetOwner();
-    nsCOMPtr<nsIDOMElement> elt;
+    RefPtr<dom::Element> elt;
     owner->GetDOMElement(getter_AddRefs(elt));
-    if (nsCOMPtr<nsINode> node = do_QueryInterface(elt)) {
-        nsCOMPtr<nsIDocument> doc = node->OwnerDoc();
+    if (elt) {
+        nsCOMPtr<nsIDocument> doc = elt->OwnerDoc();
         if (doc) {
             nsCOMPtr<nsIEventTarget> eventTarget = doc->EventTargetFor(TaskCategory::Other);
             SetEventTargetForActor(parentInstance, eventTarget);

dom/smil/nsSMILTimedElement.cpp

@@ -317,7 +317,7 @@ nsSMILTimedElement::GetTargetElement()
 }
 
 //----------------------------------------------------------------------
-// nsIDOMElementTimeControl methods
+// ElementTimeControl methods
 //
 // The definition of the ElementTimeControl interface differs between SMIL
 // Animation and SVG 1.1. In SMIL Animation all methods have a void return

dom/smil/nsSMILTimedElement.h

@@ -63,7 +63,7 @@ public:
   mozilla::dom::Element* GetTargetElement();
 
   /**
-   * Methods for supporting the nsIDOMElementTimeControl interface.
+   * Methods for supporting the ElementTimeControl interface.
    */
 
   /*

dom/tests/mochitest/general/test_domWindowUtils.html

@@ -32,10 +32,10 @@ var domWindowUtils = SpecialPowers.getDOMWindowUtils(window);
 
 var gTests = [
 /*
-  nsIDOMElement elementFromPoint(in long aX,
-                                 in long aY,
-                                 in boolean aIgnoreRootScrollFrame,
-                                 in boolean aFlushLayout);
+  Element elementFromPoint(in long aX,
+                           in long aY,
+                           in boolean aIgnoreRootScrollFrame,
+                           in boolean aFlushLayout);
 */
 async function testElementFromPoint() {
   let onscreen = document.getElementById("onscreen");

dom/xbl/nsBindingManager.cpp

@@ -17,7 +17,6 @@
 #include "plstr.h"
 #include "nsIContent.h"
 #include "nsIContentInlines.h"
-#include "nsIDOMElement.h"
 #include "nsIDocument.h"
 #include "nsContentUtils.h"
 #include "nsIPresShell.h"

dom/xbl/nsXBLService.cpp

@@ -14,7 +14,6 @@
 #include "nsIInputStream.h"
 #include "nsNameSpaceManager.h"
 #include "nsIURI.h"
-#include "nsIDOMElement.h"
 #include "nsIURL.h"
 #include "nsIChannel.h"
 #include "nsString.h"
@@ -616,7 +615,8 @@ nsXBLService::AttachGlobalKeyHandler(EventTarget* aTarget)
   if (contentNode && contentNode->GetProperty(nsGkAtoms::listener))
     return NS_OK;
 
-  nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(contentNode));
+  Element* elt =
+   contentNode && contentNode->IsElement() ? contentNode->AsElement() : nullptr;
 
   // Create the key handler
   RefPtr<nsXBLWindowKeyHandler> handler =

dom/xbl/nsXBLWindowKeyHandler.cpp

@@ -13,7 +13,6 @@
 #include "nsIServiceManager.h"
 #include "nsGkAtoms.h"
 #include "nsXBLDocumentInfo.h"
-#include "nsIDOMElement.h"
 #include "nsFocusManager.h"
 #include "nsIURI.h"
 #include "nsNetUtil.h"
@@ -162,7 +161,7 @@ nsXBLWindowKeyHandler::EnsureSpecialDocInfo()
   sXBLSpecialDocInfo->LoadDocInfo();
 }
 
-nsXBLWindowKeyHandler::nsXBLWindowKeyHandler(nsIDOMElement* aElement,
+nsXBLWindowKeyHandler::nsXBLWindowKeyHandler(Element* aElement,
                                              EventTarget* aTarget)
   : mTarget(aTarget),
     mHandler(nullptr),
@@ -953,7 +952,7 @@ nsXBLWindowKeyHandler::IsExecutableElement(Element* aElement) const
 ///////////////////////////////////////////////////////////////////////////////////
 
 already_AddRefed<nsXBLWindowKeyHandler>
-NS_NewXBLWindowKeyHandler(nsIDOMElement* aElement, EventTarget* aTarget)
+NS_NewXBLWindowKeyHandler(Element* aElement, EventTarget* aTarget)
 {
   RefPtr<nsXBLWindowKeyHandler> result =
     new nsXBLWindowKeyHandler(aElement, aTarget);

dom/xbl/nsXBLWindowKeyHandler.h

@@ -13,7 +13,6 @@
 #include "nsIDOMEventListener.h"
 
 class nsAtom;
-class nsIDOMElement;
 class nsXBLPrototypeHandler;
 
 namespace mozilla {
@@ -35,7 +34,8 @@ class nsXBLWindowKeyHandler : public nsIDOMEventListener
   typedef mozilla::dom::KeyboardEvent KeyboardEvent;
 
 public:
-  nsXBLWindowKeyHandler(nsIDOMElement* aElement, mozilla::dom::EventTarget* aTarget);
+  nsXBLWindowKeyHandler(mozilla::dom::Element* aElement,
+                        mozilla::dom::EventTarget* aTarget);
 
   void InstallKeyboardEventListenersTo(
          EventListenerManager* aEventListenerManager);
@@ -138,7 +138,7 @@ protected:
 };
 
 already_AddRefed<nsXBLWindowKeyHandler>
-NS_NewXBLWindowKeyHandler(nsIDOMElement* aElement,
+NS_NewXBLWindowKeyHandler(mozilla::dom::Element* aElement,
                           mozilla::dom::EventTarget* aTarget);
 
 #endif

dom/xml/XMLDocument.cpp

@@ -15,7 +15,6 @@
 #include "nsIDocShell.h"
 #include "nsHTMLParts.h"
 #include "nsIComponentManager.h"
-#include "nsIDOMElement.h"
 #include "nsIBaseWindow.h"
 #include "nsIDOMWindow.h"
 #include "nsCOMPtr.h"

dom/xml/nsXMLPrettyPrinter.cpp

@@ -9,7 +9,6 @@
 #include "nsIObserver.h"
 #include "nsSyncLoadService.h"
 #include "nsPIDOMWindow.h"
-#include "nsIDOMElement.h"
 #include "nsIServiceManager.h"
 #include "nsNetUtil.h"
 #include "mozilla/dom/Element.h"

dom/xslt/xpath/txMozillaXPathTreeWalker.cpp

@@ -7,7 +7,6 @@
 #include "nsAtom.h"
 #include "nsIAttribute.h"
 #include "nsIDOMDocument.h"
-#include "nsIDOMElement.h"
 #include "nsINode.h"
 #include "nsPrintfCString.h"
 #include "nsReadableUtils.h"

dom/xslt/xslt/txMozillaXSLTProcessor.cpp

@@ -8,7 +8,6 @@
 #include "nsError.h"
 #include "nsIChannel.h"
 #include "mozilla/dom/Element.h"
-#include "nsIDOMElement.h"
 #include "nsIDocument.h"
 #include "nsIDOMDocument.h"
 #include "nsIIOService.h"

dom/xul/nsXULCommandDispatcher.cpp

@@ -14,7 +14,6 @@
 #include "nsFocusManager.h"
 #include "nsIControllers.h"
 #include "nsIDOMDocument.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMWindow.h"
 #include "nsIDocument.h"
 #include "nsPresContext.h"

dom/xul/nsXULContentUtils.cpp

@@ -18,7 +18,6 @@
 #include "nsIContent.h"
 #include "nsICollation.h"
 #include "nsIDocument.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMXULCommandDispatcher.h"
 #include "nsIRDFService.h"
 #include "nsIServiceManager.h"

dom/xul/nsXULControllers.cpp

@@ -13,7 +13,6 @@
 #include "nsString.h"
 
 #include "nsIControllers.h"
-#include "nsIDOMElement.h"
 #include "nsXULControllers.h"
 #include "nsIController.h"
 

dom/xul/nsXULElement.h

@@ -650,11 +650,6 @@ protected:
     // Implementation methods
     nsresult EnsureContentsGenerated(void) const;
 
-    nsresult ExecuteOnBroadcastHandler(nsIDOMElement* anElement, const nsAString& attrName);
-
-    static nsresult
-    ExecuteJSCode(nsIDOMElement* anElement, mozilla::WidgetEvent* aEvent);
-
     // Helper routine that crawls a parent chain looking for a tree element.
     NS_IMETHOD GetParentTree(nsIDOMXULMultiSelectControlElement** aTreeElement);
 

dom/xul/nsXULPopupListener.cpp

@@ -220,7 +220,6 @@ nsXULPopupListener::FireFocusOnTargetContent(nsIDOMNode* aTargetNode, bool aIsTo
   nsCOMPtr<nsIContent> content = do_QueryInterface(aTargetNode);
   nsCOMPtr<nsIDocument> doc = content->OwnerDoc();
 
-  // Get nsIDOMElement for targetNode
   // strong reference to keep this from going away between events
   // XXXbz between what events?  We don't use this local at all!
   RefPtr<nsPresContext> context = doc->GetPresContext();

dom/xul/nsXULPopupListener.h

@@ -13,7 +13,6 @@
 #include "nsCOMPtr.h"
 
 #include "mozilla/dom/Element.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMEventListener.h"
 #include "nsCycleCollectionParticipant.h"
 

dom/xul/nsXULSortService.cpp

@@ -9,7 +9,6 @@
 
 #include "nsCOMPtr.h"
 #include "nsIContent.h"
-#include "nsIDOMElement.h"
 #include "nsIDOMNode.h"
 #include "nsIServiceManager.h"
 #include "nsGkAtoms.h"