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diff --git a/testing/web-platform/tests/svg/animations/svgtransform-animation-1.html b/testing/web-platform/tests/svg/animations/svgtransform-animation-1.html
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+++ b/testing/web-platform/tests/svg/animations/svgtransform-animation-1.html
@@ -0,0 +1,117 @@
+<!doctype html>
+<html>
+<title>Test accumulate=sum animation on SVGAnimateTransform.</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("animateTransform");
+animate.setAttribute("id", "animation");
+animate.setAttribute("attributeName", "transform");
+animate.setAttribute("type", "scale");
+animate.setAttribute("from", "0,0");
+animate.setAttribute("to", "2,2");
+animate.setAttribute("type", "scale");
+animate.setAttribute("fill", "freeze");
+animate.setAttribute("accumulate", "sum");
+animate.setAttribute("repeatCount", "3");
+animate.setAttribute("additive", "sum");
+animate.setAttribute("begin", "0s");
+animate.setAttribute("dur", "4s");
+rect.appendChild(animate);
+rootSVGElement.appendChild(rect);
+
+// Setup animation test
+function sample1() {
+    // Check initial/end conditions
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 0, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 0, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+function sample2() {
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 1, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 1, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+function sample3() {
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 2, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 2, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+function sample4() {
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 3, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 3, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+function sample5() {
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 4, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 4, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+function sample6() {
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 5, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 5, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+function sample7() {
+    assert_equals(rect.transform.animVal.numberOfItems, 1);
+    assert_equals(rect.transform.animVal.getItem(0).type, SVGTransform.SVG_TRANSFORM_SCALE);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.a, 6, epsilon);
+    assert_approx_equals(rect.transform.animVal.getItem(0).matrix.d, 6, epsilon);
+    assert_equals(rect.transform.baseVal.numberOfItems, 0);
+}
+
+smil_async_test((t) => {
+    const expectedValues = [
+        // [animationId, time, sampleCallback]
+        ["animation", 0.001,  sample1],
+        ["animation", 2.0,    sample2],
+        ["animation", 3.999,  sample3],
+        ["animation", 4.001,  sample3],
+        ["animation", 6.0,    sample4],
+        ["animation", 7.999,  sample5],
+        ["animation", 8.001,  sample5],
+        ["animation", 10.0,   sample6],
+        ["animation", 11.999, sample7],
+        ["animation", 12.001, sample7],
+        ["animation", 14.0,   sample7],
+        ["animation", 60.0,   sample7]
+    ];
+
+    runAnimationTest(t, expectedValues);
+});
+
+</script>