diff --git a/content/html/content/src/HTMLSharedElement.cpp b/content/html/content/src/HTMLSharedElement.cpp
index 34196a8bab7..7b4c7bfc6cc 100644
--- a/content/html/content/src/HTMLSharedElement.cpp
+++ b/content/html/content/src/HTMLSharedElement.cpp
@@ -34,8 +34,7 @@ NS_IMPL_RELEASE_INHERITED(HTMLSharedElement, Element)
 // QueryInterface implementation for HTMLSharedElement
 NS_INTERFACE_MAP_BEGIN(HTMLSharedElement)
   NS_HTML_CONTENT_INTERFACES_AMBIGUOUS(nsGenericHTMLElement,
-                                       nsIDOMHTMLParamElement)
-  NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMHTMLParamElement, param)
+                                       nsIDOMHTMLBaseElement)
   NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMHTMLBaseElement, base)
   NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMHTMLDirectoryElement, dir)
   NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMHTMLQuoteElement, q)
@@ -47,12 +46,6 @@ NS_ELEMENT_INTERFACE_MAP_END
 
 NS_IMPL_ELEMENT_CLONE(HTMLSharedElement)
 
-// nsIDOMHTMLParamElement
-NS_IMPL_STRING_ATTR(HTMLSharedElement, Name, name)
-NS_IMPL_STRING_ATTR(HTMLSharedElement, Type, type)
-NS_IMPL_STRING_ATTR(HTMLSharedElement, Value, value)
-NS_IMPL_STRING_ATTR(HTMLSharedElement, ValueType, valuetype)
-
 // nsIDOMHTMLQuoteElement
 NS_IMPL_URI_ATTR(HTMLSharedElement, Cite, cite)
 
diff --git a/content/html/content/src/HTMLSharedElement.h b/content/html/content/src/HTMLSharedElement.h
index 75e892161ed..afdf25979a9 100644
--- a/content/html/content/src/HTMLSharedElement.h
+++ b/content/html/content/src/HTMLSharedElement.h
@@ -6,7 +6,6 @@
 #ifndef mozilla_dom_HTMLSharedElement_h
 #define mozilla_dom_HTMLSharedElement_h
 
-#include "nsIDOMHTMLParamElement.h"
 #include "nsIDOMHTMLBaseElement.h"
 #include "nsIDOMHTMLDirectoryElement.h"
 #include "nsIDOMHTMLQuoteElement.h"
@@ -23,7 +22,6 @@ namespace mozilla {
 namespace dom {
 
 class HTMLSharedElement MOZ_FINAL : public nsGenericHTMLElement,
-                                    public nsIDOMHTMLParamElement,
                                     public nsIDOMHTMLBaseElement,
                                     public nsIDOMHTMLDirectoryElement,
                                     public nsIDOMHTMLQuoteElement,
@@ -49,9 +47,6 @@ public:
   // nsIDOMHTMLElement
   NS_FORWARD_NSIDOMHTMLELEMENT_TO_GENERIC
 
-  // nsIDOMHTMLParamElement
-  NS_DECL_NSIDOMHTMLPARAMELEMENT
-
   // nsIDOMHTMLBaseElement
   NS_DECL_NSIDOMHTMLBASEELEMENT
 
@@ -95,7 +90,7 @@ public:
 
   virtual nsIDOMNode* AsDOMNode() MOZ_OVERRIDE
   {
-    return static_cast<nsIDOMHTMLParamElement*>(this);
+    return static_cast<nsIDOMHTMLBaseElement*>(this);
   }
 
   // WebIDL API
diff --git a/dom/interfaces/html/moz.build b/dom/interfaces/html/moz.build
index a464565668c..1898fbcd157 100644
--- a/dom/interfaces/html/moz.build
+++ b/dom/interfaces/html/moz.build
@@ -46,7 +46,6 @@ XPIDL_SOURCES += [
     'nsIDOMHTMLOptionElement.idl',
     'nsIDOMHTMLOptionsCollection.idl',
     'nsIDOMHTMLParagraphElement.idl',
-    'nsIDOMHTMLParamElement.idl',
     'nsIDOMHTMLPreElement.idl',
     'nsIDOMHTMLQuoteElement.idl',
     'nsIDOMHTMLScriptElement.idl',
diff --git a/dom/interfaces/html/nsIDOMHTMLParamElement.idl b/dom/interfaces/html/nsIDOMHTMLParamElement.idl
deleted file mode 100644
index 63c1572cf43..00000000000
--- a/dom/interfaces/html/nsIDOMHTMLParamElement.idl
+++ /dev/null
@@ -1,26 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsIDOMHTMLElement.idl"
-
-/**
- * The nsIDOMHTMLParamElement interface is the interface to a [X]HTML
- * param element.
- *
- * This interface is trying to follow the DOM Level 2 HTML specification:
- * http://www.w3.org/TR/DOM-Level-2-HTML/
- *
- * with changes from the work-in-progress WHATWG HTML specification:
- * http://www.whatwg.org/specs/web-apps/current-work/
- */
-
-[scriptable, uuid(f85e1b05-6dc4-442d-bea8-7cf551f9bc9f)]
-interface nsIDOMHTMLParamElement : nsIDOMHTMLElement
-{
-           attribute DOMString        name;
-           attribute DOMString        type;
-           attribute DOMString        value;
-           attribute DOMString        valueType;
-};