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diff --git a/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-percentage-space-list.html b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-percentage-space-list.html
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+++ b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-percentage-space-list.html
@@ -0,0 +1,59 @@
+<!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>