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diff --git a/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-transition-inherited-used-by-standard-property.html b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-transition-inherited-used-by-standard-property.html
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+++ b/testing/web-platform/tests/css/css-properties-values-api/animation/custom-property-transition-inherited-used-by-standard-property.html
@@ -0,0 +1,31 @@
+<!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="container">
+ <div id="target"></div>
+</div>
+<script>
+
+test(() => {
+ const customProperty = "--my-length";
+
+ CSS.registerProperty({
+ name: customProperty,
+ syntax: "<length>",
+ inherits: true,
+ initialValue: "100px"
+ });
+
+ target.style.marginLeft = `var(${customProperty})`;
+ assert_equals(getComputedStyle(target).marginLeft, "100px");
+ assert_equals(getComputedStyle(target).getPropertyValue(customProperty), "100px");
+
+ container.style.transition = `${customProperty} 1s -500ms linear`;
+ container.style.setProperty(customProperty, "200px");
+
+ assert_equals(getComputedStyle(target).marginLeft, "150px");
+}, "Running a transition an inherited CSS variable is reflected on a standard property using that variable as a value");
+
+</script> \ No newline at end of file