diff --git a/svg/animations/animate-marker-orient-from-auto-to-auto-start-reverse.html b/svg/animations/animate-marker-orient-from-auto-to-auto-start-reverse.html
index fedfe4a8c2818a..b7a4e68562da57 100644
--- a/svg/animations/animate-marker-orient-from-auto-to-auto-start-reverse.html
+++ b/svg/animations/animate-marker-orient-from-auto-to-auto-start-reverse.html
@@ -76,7 +76,7 @@
     assert_approx_equals(marker.orientAngle.animVal.value, 0, epsilon);
     assert_equals(marker.orientAngle.baseVal.value, 0);
 
-    assert_equals(marker.orientType.animVal, SVGMarkerElement.SVG_MARKER_ORIENT_UNKNOWN);
+    assert_equals(marker.orientType.animVal, SVGMarkerElement.SVG_MARKER_ORIENT_AUTO_START_REVERSE);
     assert_equals(marker.orientType.baseVal, SVGMarkerElement.SVG_MARKER_ORIENT_ANGLE);
 }
 
@@ -94,4 +94,4 @@
     runAnimationTest(t, expectedValues);
 });
 
-</script>
\ No newline at end of file
+</script>
diff --git a/svg/types/scripted/SVGAnimatedEnumeration-SVGMarkerElement.html b/svg/types/scripted/SVGAnimatedEnumeration-SVGMarkerElement.html
index 7ac884ae3e5052..dfc9dd248007c9 100644
--- a/svg/types/scripted/SVGAnimatedEnumeration-SVGMarkerElement.html
+++ b/svg/types/scripted/SVGAnimatedEnumeration-SVGMarkerElement.html
@@ -90,8 +90,17 @@
 
   markerElement.setAttribute('orient', '10deg');
 
+  // Switch to 'auto-start-reverse' value - by modifying orientType.
+  markerElement.orientType.baseVal = SVGMarkerElement.SVG_MARKER_ORIENT_AUTO_START_REVERSE;
+  assert_equals(markerElement.orientAngle.baseVal.value, 0);
+  assert_equals(markerElement.orientAngle.baseVal.unitType, SVGAngle.SVG_ANGLETYPE_UNSPECIFIED);
+  assert_equals(markerElement.orientType.baseVal, SVGMarkerElement.SVG_MARKER_ORIENT_AUTO_START_REVERSE);
+  assert_equals(markerElement.getAttribute('orient'), "auto-start-reverse");
+
+  markerElement.setAttribute('orient', '10deg');
+
   // Try setting invalid values.
-  assert_throws_js(TypeError, function() { markerElement.orientType.baseVal = 3; });
+  assert_throws_js(TypeError, function() { markerElement.orientType.baseVal = 4; });
   assert_equals(markerElement.orientType.baseVal, SVGMarkerElement.SVG_MARKER_ORIENT_ANGLE);
   assert_equals(markerElement.getAttribute('orient'), "10deg");
 
@@ -110,4 +119,4 @@
   assert_equals(markerElement.orientType.baseVal, SVGMarkerElement.SVG_MARKER_ORIENT_AUTO);
   assert_equals(markerElement.getAttribute('orient'), "auto");
 });
-</script>
\ No newline at end of file
+</script>