diff --git a/dom/canvas/CanvasRenderingContext2D.cpp b/dom/canvas/CanvasRenderingContext2D.cpp
index d2872b28e328..3f0b2113ab75 100644
--- a/dom/canvas/CanvasRenderingContext2D.cpp
+++ b/dom/canvas/CanvasRenderingContext2D.cpp
@@ -1735,6 +1735,12 @@ CanvasRenderingContext2D::SetTransform(double m11, double m12,
   mTarget->SetTransform(matrix);
 }
 
+void
+CanvasRenderingContext2D::ResetTransform(ErrorResult& error)
+{
+  SetTransform(1.0, 0.0, 0.0, 1.0, 0.0, 0.0, error);
+}
+
 static void
 MatrixToJSObject(JSContext* cx, const Matrix& matrix,
                  JS::MutableHandle<JSObject*> result, ErrorResult& error)
diff --git a/dom/canvas/CanvasRenderingContext2D.h b/dom/canvas/CanvasRenderingContext2D.h
index d4358a404074..8593502248dd 100644
--- a/dom/canvas/CanvasRenderingContext2D.h
+++ b/dom/canvas/CanvasRenderingContext2D.h
@@ -148,6 +148,7 @@ public:
                  double dy, mozilla::ErrorResult& error);
   void SetTransform(double m11, double m12, double m21, double m22, double dx,
                     double dy, mozilla::ErrorResult& error);
+  void ResetTransform(mozilla::ErrorResult& error);
 
   double GlobalAlpha()
   {
diff --git a/dom/canvas/test/test_canvas.html b/dom/canvas/test/test_canvas.html
index 6a241fcf756e..48f26e22a1a7 100644
--- a/dom/canvas/test/test_canvas.html
+++ b/dom/canvas/test/test_canvas.html
@@ -19182,6 +19182,7 @@ isPixel(ctx, 50,25, 0,255,0,255, 0);
 
 
 }
+
 </script>
 
 <!-- [[[ test_2d.transformation.transform.multiply.html ]]] -->
@@ -19558,6 +19559,9 @@ if (ctx.transform) { // (avoid spurious failures, since the aim here is not to t
 if (ctx.setTransform) {
     ok(ctx.setTransform(1, 0, 0, 1, 0, 0) === undefined, "ctx.setTransform(1, 0, 0, 1, 0, 0) === undefined");
 }
+if (ctx.resetTransform) {
+    ok(ctx.resetTransform() === undefined, "ctx.resetTransform() === undefined");
+}
 ok(ctx.clearRect(0, 0, 0, 0) === undefined, "ctx.clearRect(0, 0, 0, 0) === undefined");
 ok(ctx.fillRect(0, 0, 0, 0) === undefined, "ctx.fillRect(0, 0, 0, 0) === undefined");
 ok(ctx.strokeRect(0, 0, 0, 0) === undefined, "ctx.strokeRect(0, 0, 0, 0) === undefined");
@@ -21552,6 +21556,31 @@ function test_opaque() {
 }
 </script>
 
+<p>Canvas test: 2d.transformation.transform.identity</p>
+<!-- Testing: resetTransform() changes to the identity matrix -->
+<canvas id="c689" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+<script>
+
+
+function test_2d_transformation_reset_transform() {
+
+var canvas = document.getElementById('c689');
+var ctx = canvas.getContext('2d');
+
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+
+ctx.setTransform(0.1, 0.0, 0.0, 0.1, 80.0, 30.0);
+ctx.resetTransform();
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+isPixel(ctx, 50,25, 0,255,0,255, 0);
+
+
+}
+
+</script>
+
 <script>
 
 function asyncTestsDone() {
@@ -24844,6 +24873,11 @@ try {
   throw e;
   ok(false, "unexpected exception thrown in: test_opaque");
  }
+ try {
+  test_2d_transformation_reset_transform();
+ } catch (e) {
+  ok(false, "unexpected exception thrown in: test_2d_transformation_reset_transform");
+ }
  try {
   // run this test last since it replaces the getContext method
   test_type_replace();
diff --git a/dom/webidl/CanvasRenderingContext2D.webidl b/dom/webidl/CanvasRenderingContext2D.webidl
index 3f37795925dd..0f24f684a064 100644
--- a/dom/webidl/CanvasRenderingContext2D.webidl
+++ b/dom/webidl/CanvasRenderingContext2D.webidl
@@ -47,7 +47,8 @@ interface CanvasRenderingContext2D {
   void transform(double a, double b, double c, double d, double e, double f);
   [Throws, LenientFloat]
   void setTransform(double a, double b, double c, double d, double e, double f);
-// NOT IMPLEMENTED  void resetTransform();
+  [Throws]
+  void resetTransform();
 
   // compositing
            attribute unrestricted double globalAlpha; // (default 1.0)
diff --git a/testing/web-platform/meta/html/dom/interfaces.html.ini b/testing/web-platform/meta/html/dom/interfaces.html.ini
index 8b081b685e68..9b7400b7eeaa 100644
--- a/testing/web-platform/meta/html/dom/interfaces.html.ini
+++ b/testing/web-platform/meta/html/dom/interfaces.html.ini
@@ -2214,9 +2214,6 @@
   [CanvasRenderingContext2D interface: attribute currentTransform]
     expected: FAIL
 
-  [CanvasRenderingContext2D interface: operation resetTransform()]
-    expected: FAIL
-
   [CanvasRenderingContext2D interface: attribute imageSmoothingEnabled]
     expected: FAIL
 
@@ -2295,9 +2292,6 @@
   [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "currentTransform" with the proper type (6)]
     expected: FAIL
 
-  [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "resetTransform" with the proper type (12)]
-    expected: FAIL
-
   [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "imageSmoothingEnabled" with the proper type (15)]
     expected: FAIL