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diff --git a/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-resolution-comma-list.html b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-resolution-comma-list.html
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+++ b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-animation-resolution-comma-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: "<resolution>#",
+  inherits: false,
+  initialValue: "0dppx"
+}, {
+  keyframes: ["100dppx, 150dppx", "200dppx, 250dppx"],
+  expected: "150dppx, 200dppx"
+}, 'Animating a custom property of type <resolution>#');
+
+animation_test({
+  syntax: "<resolution>#",
+  inherits: false,
+  initialValue: "100dppx, 150dppx"
+}, {
+  keyframes: "200dppx, 250dppx",
+  expected: "150dppx, 200dppx"
+}, 'Animating a custom property of type <resolution># with a single keyframe');
+
+animation_test({
+  syntax: "<resolution>#",
+  inherits: false,
+  initialValue: "50dppx, 100dppx"
+}, {
+  composite: "add",
+  keyframes: ["150dppx, 200dppx", "250dppx, 300dppx"],
+  expected: "250dppx, 350dppx"
+}, 'Animating a custom property of type <resolution># with additivity');
+
+animation_test({
+  syntax: "<resolution>#",
+  inherits: false,
+  initialValue: "50dppx, 100dppx"
+}, {
+  composite: "add",
+  keyframes: "150dppx, 200dppx",
+  expected: "125dppx, 200dppx"
+}, 'Animating a custom property of type <resolution># with a single keyframe and additivity');
+
+animation_test({
+  syntax: "<resolution>#",
+  inherits: false,
+  initialValue: "0dppx, 0dppx"
+}, {
+  iterationComposite: "accumulate",
+  keyframes: ["0dppx, 50dppx", "100dppx, 100dppx"],
+  expected: "250dppx, 275dppx"
+}, 'Animating a custom property of type <resolution># with iterationComposite');
+
+discrete_animation_test("<resolution>#", '10dppx, 20dppx', '30dppx', 'Animating a custom property of type <resolution># with different lengths is discrete');
+
+</script>