diff --git a/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation.html b/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation-001.html
similarity index 91%
rename from testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation.html
rename to testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation-001.html
index 55ebb0a3c9a0..21271ff0308f 100644
--- a/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation.html
+++ b/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation-001.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<title>An animation of an attribute does not change the DOM attribute value</title>
+<title>An animation of an attribute ('class') does not change the DOM attribute value</title>
 <link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#BasicAnim">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
diff --git a/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation-002.html b/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation-002.html
new file mode 100644
index 000000000000..29878d02cbd7
--- /dev/null
+++ b/testing/web-platform/tests/svg/animations/attribute-value-unaffected-by-animation-002.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>An animation of an attribute ('orient') does not change the DOM attribute value</title>
+<link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#BasicAnim">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<svg>
+  <marker orient="90">
+    <set attributeName="orient" to="auto"/>
+  </rect>
+</svg>
+<script>
+  async_test(t => {
+    onload = t.step_func(() => {
+      requestAnimationFrame(t.step_func_done(() => {
+        let marker = document.querySelector('marker');
+        marker.orientAngle.baseVal.valueInSpecifiedUnits = 180;
+        assert_equals(marker.getAttribute('orient'), '180');
+      }));
+    });
+  });
+</script>
