diff --git a/browser/installer/package-manifest.in b/browser/installer/package-manifest.in
index e66d99e0f6dd..1b5a82e27cbe 100644
--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -703,7 +703,6 @@
 
 ; svg
 @RESPATH@/res/svg.css
-@RESPATH@/components/dom_svg.xpt
 @RESPATH@/components/dom_smil.xpt
 
 ; [Personal Security Manager]
diff --git a/dom/interfaces/svg/moz.build b/dom/interfaces/svg/moz.build
deleted file mode 100644
index 417dd6e60bb4..000000000000
--- a/dom/interfaces/svg/moz.build
+++ /dev/null
@@ -1,15 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# 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/.
-
-with Files("**"):
-    BUG_COMPONENT = ("Core", "SVG")
-
-XPIDL_SOURCES += [
-    'nsIDOMSVGElement.idl',
-]
-
-XPIDL_MODULE = 'dom_svg'
-
diff --git a/dom/interfaces/svg/nsIDOMSVGElement.idl b/dom/interfaces/svg/nsIDOMSVGElement.idl
deleted file mode 100644
index c11ff5d83e84..000000000000
--- a/dom/interfaces/svg/nsIDOMSVGElement.idl
+++ /dev/null
@@ -1,17 +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 "nsIDOMElement.idl"
-
-[uuid(c63517c5-8bab-4cd1-8694-bccafc32a195)]
-interface nsIDOMSVGElement : nsIDOMElement
-{
-            // raises DOMException on setting
-  readonly attribute nsIDOMSVGElement    ownerSVGElement;
-  readonly attribute nsIDOMSVGElement    viewportElement;
-
-  [binaryname(SVGClassName)]
-  readonly attribute nsISupports   className;
-};
diff --git a/dom/moz.build b/dom/moz.build
index c13a973b0eee..092b1789521e 100644
--- a/dom/moz.build
+++ b/dom/moz.build
@@ -29,7 +29,6 @@ interfaces = [
     'offline',
     'geolocation',
     'notification',
-    'svg',
     'smil',
     'push',
     'payments',
diff --git a/dom/svg/DOMSVGLength.h b/dom/svg/DOMSVGLength.h
index 0816f8e0287a..d7cbf9eaf163 100644
--- a/dom/svg/DOMSVGLength.h
+++ b/dom/svg/DOMSVGLength.h
@@ -183,7 +183,7 @@ public:
 
   nsISupports* GetParentObject() const {
     auto svgElement = mList ? Element() : mSVGElement.get();
-    return static_cast<nsIDOMSVGElement*> (svgElement);
+    return static_cast<nsIDOMElement*>(svgElement);
   }
 
   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
diff --git a/dom/svg/SVGAElement.cpp b/dom/svg/SVGAElement.cpp
index c5e469aad629..d8b4d28a68fc 100644
--- a/dom/svg/SVGAElement.cpp
+++ b/dom/svg/SVGAElement.cpp
@@ -41,7 +41,6 @@ nsSVGElement::StringInfo SVGAElement::sStringInfo[3] =
 NS_INTERFACE_MAP_BEGIN(SVGAElement)
   NS_INTERFACE_MAP_ENTRY(nsIDOMNode)
   NS_INTERFACE_MAP_ENTRY(nsIDOMElement)
-  NS_INTERFACE_MAP_ENTRY(nsIDOMSVGElement)
   NS_INTERFACE_MAP_ENTRY(Link)
 NS_INTERFACE_MAP_END_INHERITING(SVGAElementBase)
 
diff --git a/dom/svg/SVGAnimationElement.h b/dom/svg/SVGAnimationElement.h
index e90ca783d143..81dd7255a7ec 100644
--- a/dom/svg/SVGAnimationElement.h
+++ b/dom/svg/SVGAnimationElement.h
@@ -89,7 +89,7 @@ public:
 
   // SVGTests
   virtual bool IsInChromeDoc() const override;
-
+  nsSVGElement* AsSVGElement() final { return this; }
 
  protected:
   // nsSVGElement overrides
diff --git a/dom/svg/SVGDocument.cpp b/dom/svg/SVGDocument.cpp
index 8b44f8305c71..6b16cc078d85 100644
--- a/dom/svg/SVGDocument.cpp
+++ b/dom/svg/SVGDocument.cpp
@@ -16,7 +16,6 @@
 #include "nsServiceManagerUtils.h"
 #include "nsString.h"
 #include "nsLiteralString.h"
-#include "nsIDOMSVGElement.h"
 #include "mozilla/dom/Element.h"
 #include "nsSVGElement.h"
 #include "mozilla/StyleSheet.h"
diff --git a/dom/svg/SVGFEImageElement.cpp b/dom/svg/SVGFEImageElement.cpp
index 36a305ab1045..7a70f0dc6eaf 100644
--- a/dom/svg/SVGFEImageElement.cpp
+++ b/dom/svg/SVGFEImageElement.cpp
@@ -43,7 +43,7 @@ nsSVGElement::StringInfo SVGFEImageElement::sStringInfo[3] =
 // nsISupports methods
 
 NS_IMPL_ISUPPORTS_INHERITED(SVGFEImageElement, SVGFEImageElementBase,
-                            nsIDOMNode, nsIDOMElement, nsIDOMSVGElement,
+                            nsIDOMNode, nsIDOMElement,
                             imgINotificationObserver, nsIImageLoadingContent)
 
 //----------------------------------------------------------------------
diff --git a/dom/svg/SVGGraphicsElement.h b/dom/svg/SVGGraphicsElement.h
index a6437dba9ed6..8f3b48f8ba7d 100644
--- a/dom/svg/SVGGraphicsElement.h
+++ b/dom/svg/SVGGraphicsElement.h
@@ -27,6 +27,7 @@ public:
   NS_DECL_ISUPPORTS_INHERITED
 
   bool IsInChromeDoc() const override;
+  nsSVGElement* AsSVGElement() final { return this; }
 };
 
 } // namespace dom
diff --git a/dom/svg/SVGImageElement.cpp b/dom/svg/SVGImageElement.cpp
index 8e2530965043..3b87afd58777 100644
--- a/dom/svg/SVGImageElement.cpp
+++ b/dom/svg/SVGImageElement.cpp
@@ -50,7 +50,6 @@ nsSVGElement::StringInfo SVGImageElement::sStringInfo[2] =
 
 NS_IMPL_ISUPPORTS_INHERITED(SVGImageElement, SVGImageElementBase,
                             nsIDOMNode, nsIDOMElement,
-                            nsIDOMSVGElement,
                             imgINotificationObserver,
                             nsIImageLoadingContent)
 
diff --git a/dom/svg/SVGMPathElement.cpp b/dom/svg/SVGMPathElement.cpp
index 9ce89052a9b2..882265dd5f83 100644
--- a/dom/svg/SVGMPathElement.cpp
+++ b/dom/svg/SVGMPathElement.cpp
@@ -51,7 +51,6 @@ NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(SVGMPathElement,
                                              SVGMPathElementBase,
                                              nsIDOMNode,
                                              nsIDOMElement,
-                                             nsIDOMSVGElement,
                                              nsIMutationObserver)
 
 // Constructor
diff --git a/dom/svg/SVGSVGElement.cpp b/dom/svg/SVGSVGElement.cpp
index 4d7a714c349f..bb6f0e08739e 100644
--- a/dom/svg/SVGSVGElement.cpp
+++ b/dom/svg/SVGSVGElement.cpp
@@ -69,7 +69,7 @@ DOMSVGTranslatePoint::Copy()
 nsISupports*
 DOMSVGTranslatePoint::GetParentObject()
 {
-  return static_cast<nsIDOMSVGElement*>(mElement);
+  return static_cast<nsIDOMElement*>(mElement);
 }
 
 void
@@ -123,8 +123,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(SVGSVGElement,
                                              SVGSVGElementBase,
                                              nsIDOMNode,
-                                             nsIDOMElement,
-                                             nsIDOMSVGElement)
+                                             nsIDOMElement)
 
 SVGView::SVGView()
 {
diff --git a/dom/svg/SVGScriptElement.cpp b/dom/svg/SVGScriptElement.cpp
index 3f9ebbb26f86..6ba5ec179f04 100644
--- a/dom/svg/SVGScriptElement.cpp
+++ b/dom/svg/SVGScriptElement.cpp
@@ -33,7 +33,6 @@ nsSVGElement::StringInfo SVGScriptElement::sStringInfo[2] =
 
 NS_IMPL_ISUPPORTS_INHERITED(SVGScriptElement, SVGScriptElementBase,
                             nsIDOMNode, nsIDOMElement,
-                            nsIDOMSVGElement,
                             nsIScriptLoaderObserver,
                             nsIScriptElement, nsIMutationObserver)
 
diff --git a/dom/svg/SVGSymbolElement.cpp b/dom/svg/SVGSymbolElement.cpp
index 71ba2199e008..13e22527e273 100644
--- a/dom/svg/SVGSymbolElement.cpp
+++ b/dom/svg/SVGSymbolElement.cpp
@@ -23,7 +23,7 @@ SVGSymbolElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
 
 NS_IMPL_ISUPPORTS_INHERITED(SVGSymbolElement, SVGSymbolElementBase,
                             nsIDOMNode, nsIDOMElement,
-                            nsIDOMSVGElement, mozilla::dom::SVGTests)
+                            mozilla::dom::SVGTests)
 
 //----------------------------------------------------------------------
 // Implementation
diff --git a/dom/svg/SVGTests.cpp b/dom/svg/SVGTests.cpp
index f4ff9dd5c422..0a59ddb2cb20 100644
--- a/dom/svg/SVGTests.cpp
+++ b/dom/svg/SVGTests.cpp
@@ -30,28 +30,22 @@ SVGTests::SVGTests()
 already_AddRefed<DOMSVGStringList>
 SVGTests::RequiredFeatures()
 {
-  nsCOMPtr<nsIDOMSVGElement> elem = do_QueryInterface(this);
-  nsSVGElement* element = static_cast<nsSVGElement*>(elem.get());
   return DOMSVGStringList::GetDOMWrapper(
-           &mStringListAttributes[FEATURES], element, true, FEATURES);
+           &mStringListAttributes[FEATURES], AsSVGElement(), true, FEATURES);
 }
 
 already_AddRefed<DOMSVGStringList>
 SVGTests::RequiredExtensions()
 {
-  nsCOMPtr<nsIDOMSVGElement> elem = do_QueryInterface(this);
-  nsSVGElement* element = static_cast<nsSVGElement*>(elem.get());
   return DOMSVGStringList::GetDOMWrapper(
-           &mStringListAttributes[EXTENSIONS], element, true, EXTENSIONS);
+           &mStringListAttributes[EXTENSIONS], AsSVGElement(), true, EXTENSIONS);
 }
 
 already_AddRefed<DOMSVGStringList>
 SVGTests::SystemLanguage()
 {
-  nsCOMPtr<nsIDOMSVGElement> elem = do_QueryInterface(this);
-  nsSVGElement* element = static_cast<nsSVGElement*>(elem.get());
   return DOMSVGStringList::GetDOMWrapper(
-           &mStringListAttributes[LANGUAGE], element, true, LANGUAGE);
+           &mStringListAttributes[LANGUAGE], AsSVGElement(), true, LANGUAGE);
 }
 
 bool
@@ -224,10 +218,7 @@ SVGTests::GetAttrValue(uint8_t aAttrEnum, nsAttrValue& aValue) const
 void
 SVGTests::MaybeInvalidate()
 {
-  nsCOMPtr<nsIDOMSVGElement> elem = do_QueryInterface(this);
-  nsSVGElement* element = static_cast<nsSVGElement*>(elem.get());
-
-  nsIContent* parent = element->GetFlattenedTreeParent();
+  nsIContent* parent = AsSVGElement()->GetFlattenedTreeParent();
 
   if (parent &&
       parent->NodeInfo()->Equals(nsGkAtoms::svgSwitch, kNameSpaceID_SVG)) {
diff --git a/dom/svg/SVGTests.h b/dom/svg/SVGTests.h
index 864370de2954..2a9340c90660 100644
--- a/dom/svg/SVGTests.h
+++ b/dom/svg/SVGTests.h
@@ -14,6 +14,7 @@
 class nsAttrValue;
 class nsAtom;
 class nsStaticAtom;
+class nsSVGElement;
 
 namespace mozilla {
 class DOMSVGStringList;
@@ -96,6 +97,7 @@ public:
   bool HasExtension(const nsAString& aExtension);
 
   virtual bool IsInChromeDoc() const = 0;
+  virtual nsSVGElement* AsSVGElement() = 0;
 
 protected:
   virtual ~SVGTests() {}
diff --git a/dom/svg/SVGTitleElement.cpp b/dom/svg/SVGTitleElement.cpp
index 1b32c0c09577..603d3a942297 100644
--- a/dom/svg/SVGTitleElement.cpp
+++ b/dom/svg/SVGTitleElement.cpp
@@ -23,7 +23,6 @@ SVGTitleElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
 
 NS_IMPL_ISUPPORTS_INHERITED(SVGTitleElement, SVGTitleElementBase,
                             nsIDOMNode, nsIDOMElement,
-                            nsIDOMSVGElement,
                             nsIMutationObserver)
 
 //----------------------------------------------------------------------
diff --git a/dom/svg/nsSVGElement.cpp b/dom/svg/nsSVGElement.cpp
index db83a4ce307e..194931cac692 100644
--- a/dom/svg/nsSVGElement.cpp
+++ b/dom/svg/nsSVGElement.cpp
@@ -110,15 +110,6 @@ nsSVGElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
   return SVGElementBinding::Wrap(aCx, this, aGivenProto);
 }
 
-//----------------------------------------------------------------------
-
-NS_IMETHODIMP
-nsSVGElement::GetSVGClassName(nsISupports** aClassName)
-{
-  *aClassName = ClassName().take();
-  return NS_OK;
-}
-
 //----------------------------------------------------------------------
 // nsSVGElement methods
 
@@ -247,8 +238,7 @@ nsSVGElement::Init()
 // nsISupports methods
 
 NS_IMPL_ISUPPORTS_INHERITED(nsSVGElement, nsSVGElementBase,
-                            nsIDOMNode, nsIDOMElement,
-                            nsIDOMSVGElement)
+                            nsIDOMNode, nsIDOMElement)
 
 //----------------------------------------------------------------------
 // Implementation
@@ -1099,14 +1089,6 @@ nsSVGElement::sMaskMap[] = {
 
 
 //----------------------------------------------------------------------
-// nsIDOMSVGElement methods
-
-NS_IMETHODIMP
-nsSVGElement::GetOwnerSVGElement(nsIDOMSVGElement * *aOwnerSVGElement)
-{
-  NS_IF_ADDREF(*aOwnerSVGElement = GetOwnerSVGElement());
-  return NS_OK;
-}
 
 SVGSVGElement*
 nsSVGElement::GetOwnerSVGElement()
@@ -1127,14 +1109,6 @@ nsSVGElement::GetOwnerSVGElement()
   return nullptr;
 }
 
-NS_IMETHODIMP
-nsSVGElement::GetViewportElement(nsIDOMSVGElement * *aViewportElement)
-{
-  nsSVGElement* elem = GetViewportElement();
-  NS_ADDREF(*aViewportElement = elem);
-  return NS_OK;
-}
-
 nsSVGElement*
 nsSVGElement::GetViewportElement()
 {
@@ -2479,7 +2453,7 @@ nsSVGElement::WillChangeStringList(bool aIsConditionalProcessingAttribute,
 {
   nsAtom* name;
   if (aIsConditionalProcessingAttribute) {
-    nsCOMPtr<SVGTests> tests(do_QueryInterface(static_cast<nsIDOMSVGElement*>(this)));
+    nsCOMPtr<SVGTests> tests(do_QueryInterface(static_cast<nsIDOMElement*>(this)));
     name = tests->GetAttrName(aAttrEnum);
   } else {
     name = *GetStringListInfo().mStringListInfo[aAttrEnum].mName;
diff --git a/dom/svg/nsSVGElement.h b/dom/svg/nsSVGElement.h
index 34e0e99fc05a..bf1a7ba825a3 100644
--- a/dom/svg/nsSVGElement.h
+++ b/dom/svg/nsSVGElement.h
@@ -24,7 +24,7 @@
 #include "nsISupportsImpl.h"
 #include "nsStyledElement.h"
 #include "nsSVGClass.h"
-#include "nsIDOMSVGElement.h"
+#include "nsIDOMElement.h"
 #include "SVGContentUtils.h"
 #include "gfxMatrix.h"
 
@@ -70,7 +70,7 @@ struct nsSVGEnumMapping;
 typedef nsStyledElement nsSVGElementBase;
 
 class nsSVGElement : public nsSVGElementBase    // nsIContent
-                   , public nsIDOMSVGElement
+                   , public nsIDOMElement
 {
 protected:
   explicit nsSVGElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
@@ -136,7 +136,7 @@ public:
   static const MappedAttributeEntry sLightingEffectsMap[];
   static const MappedAttributeEntry sMaskMap[];
 
-  NS_DECL_NSIDOMSVGELEMENT
+  NS_DECL_NSIDOMELEMENT
 
   NS_IMPL_FROMCONTENT(nsSVGElement, kNameSpaceID_SVG)
 
diff --git a/dom/svg/nsSVGFilters.h b/dom/svg/nsSVGFilters.h
index 326208fe5b0c..8c5b3b4cf293 100644
--- a/dom/svg/nsSVGFilters.h
+++ b/dom/svg/nsSVGFilters.h
@@ -189,7 +189,7 @@ public:
           int32_t aNameSpaceID, nsAtom* aAttribute) const override;
   virtual nsSVGString& GetResultImageName() override { return mStringAttributes[RESULT]; }
   virtual void GetSourceImageNames(nsTArray<nsSVGStringInfo>& aSources) override;
-  NS_FORWARD_NSIDOMSVGELEMENT(nsSVGFELightingElementBase::)
+  NS_FORWARD_NSIDOMELEMENT(nsSVGFELightingElementBase::)
 
   NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const override;
 
diff --git a/mobile/android/installer/package-manifest.in b/mobile/android/installer/package-manifest.in
index 626d6351f1dc..57bd2f321799 100644
--- a/mobile/android/installer/package-manifest.in
+++ b/mobile/android/installer/package-manifest.in
@@ -480,7 +480,6 @@
 
 ; svg
 @BINPATH@/res/svg.css
-@BINPATH@/components/dom_svg.xpt
 @BINPATH@/components/dom_smil.xpt
 
 ; [Personal Security Manager]
diff --git a/xpcom/reflect/xptinfo/ShimInterfaceInfo.cpp b/xpcom/reflect/xptinfo/ShimInterfaceInfo.cpp
index ed4393bc531a..bb4c16ec58d8 100644
--- a/xpcom/reflect/xptinfo/ShimInterfaceInfo.cpp
+++ b/xpcom/reflect/xptinfo/ShimInterfaceInfo.cpp
@@ -58,7 +58,6 @@
 #include "nsIDOMScrollAreaEvent.h"
 #include "nsIDOMSerializer.h"
 #include "nsIDOMSimpleGestureEvent.h"
-#include "nsIDOMSVGElement.h"
 #include "nsIDOMText.h"
 #include "nsIDOMTimeEvent.h"
 #include "nsIDOMTimeRanges.h"
@@ -280,7 +279,6 @@ const ComponentsInterfaceShimEntry kComponentsInterfaceShimMap[] =
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIScrollBoxObject, ScrollBoxObject),
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIDOMSerializer, XMLSerializer),
   DEFINE_SHIM(SimpleGestureEvent),
-  DEFINE_SHIM(SVGElement),
   DEFINE_SHIM(Text),
   DEFINE_SHIM(TimeEvent),
   DEFINE_SHIM(TimeRanges),