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diff --git a/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-percentage-comma-list.html b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-percentage-comma-list.html
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+++ b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-percentage-comma-list.html
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+<!DOCTYPE html>
+<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/utils.js"></script>
+<div id="target"></div>
+<script>
+
+animation_test({
+  syntax: "<percentage>#",
+  inherits: false,
+  initialValue: "0%"
+}, {
+  keyframes: ["100%, 150%", "200%, 250%"],
+  expected: "150%, 200%"
+}, 'Animating a custom property of type <percentage>#');
+
+animation_test({
+  syntax: "<percentage>#",
+  inherits: false,
+  initialValue: "100%, 150%"
+}, {
+  keyframes: "200%, 250%",
+  expected: "150%, 200%"
+}, 'Animating a custom property of type <percentage># with a single keyframe');
+
+animation_test({
+  syntax: "<percentage>#",
+  inherits: false,
+  initialValue: "50%, 100%"
+}, {
+  composite: "add",
+  keyframes: ["150%, 200%", "250%, 300%"],
+  expected: "250%, 350%"
+}, 'Animating a custom property of type <percentage># with additivity');
+
+animation_test({
+  syntax: "<percentage>#",
+  inherits: false,
+  initialValue: "50%, 100%"
+}, {
+  composite: "add",
+  keyframes: "150%, 200%",
+  expected: "125%, 200%"
+}, 'Animating a custom property of type <percentage># with a single keyframe and additivity');
+
+animation_test({
+  syntax: "<percentage>#",
+  inherits: false,
+  initialValue: "0%, 0%"
+}, {
+  iterationComposite: "accumulate",
+  keyframes: ["0%, 50%", "100%, 100%"],
+  expected: "250%, 275%"
+}, 'Animating a custom property of type <percentage># with iterationComposite');
+
+discrete_animation_test("<percentage>#", '10%, 20%', '30%', 'Animating a custom property of type <percentage># with different lengths is discrete');
+
+</script>