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diff --git a/testing/web-platform/tests/svg/animations/svgstring-animation-fallback-to-discrete.html b/testing/web-platform/tests/svg/animations/svgstring-animation-fallback-to-discrete.html
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index 0000000000..8cf6c34af0
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+++ b/testing/web-platform/tests/svg/animations/svgstring-animation-fallback-to-discrete.html
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+<!doctype html>
+<html>
+<title>Tests fallback to calcMode='discrete' on animation of SVGString with 'values'.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/SVGAnimationTestCase-testharness.js"></script>
+
+<svg>
+</svg>
+
+<script>
+var rootSVGElement = document.querySelector("svg");
+var epsilon = 1.0;
+
+// Setup test document
+var rect = createSVGElement("rect");
+rect.setAttribute("id", "rect");
+rect.setAttribute("width", "100");
+rect.setAttribute("height", "100");
+rect.setAttribute("fill", "green");
+rect.setAttribute("onclick", "executeTest()");
+
+var animate = createSVGElement("animate");
+animate.setAttribute("id", "animation");
+animate.setAttribute("attributeName", "visibility");
+animate.setAttribute("begin", "0s");
+animate.setAttribute("dur", "6s");
+animate.setAttribute("calcMode", "linear");
+animate.setAttribute("values", "visible ; hidden ; visible");
+rect.appendChild(animate);
+rootSVGElement.appendChild(rect);
+
+// Setup animation test
+function sample1() {
+    // Check initial/end conditions
+    assert_equals(getComputedStyle(rect).visibility, 'visible');
+    assert_equals(rect.style.visibility, "");
+}
+
+function sample2() {
+    assert_equals(getComputedStyle(rect).visibility, 'hidden');
+    assert_equals(rect.style.visibility, "");
+}
+
+function sample3() {
+    assert_equals(getComputedStyle(rect).visibility, 'visible');
+    assert_equals(rect.style.visibility, "");
+}
+
+smil_async_test((t) => {
+    const expectedValues = [
+        // [animationId, time, sampleCallback]
+        ["animation", 1.999, sample1],
+        ["animation", 2.001, sample2],
+        ["animation", 5.999, sample3],
+        ["animation", 6.001, sample1]
+    ];
+
+    runAnimationTest(t, expectedValues);
+});
+
+</script>