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diff --git a/testing/web-platform/tests/css/css-variables/variable-created-document.html b/testing/web-platform/tests/css/css-variables/variable-created-document.html
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+++ b/testing/web-platform/tests/css/css-variables/variable-created-document.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Variable added to created document</title>
+
+    <meta rel="author" title="Kevin Babbitt">
+    <meta rel="author" title="Greg Whitworth">
+    <link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
+    <!-- This is not directly stated in the spec, but still worth testing to ensure it works -->
+    <link rel="help" href="http://www.w3.org/TR/css-variables-1/#defining-variables">
+
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="target">This text should be green.</div>
+    <script type="text/javascript">
+        "use strict";
+
+        var workDocument = document.implementation.createHTMLDocument("");
+        workDocument.documentElement.innerHTML = "<style id='style'>#target { --c: rgb(0, 136, 0); color: var(--c) }</style>";
+        document.head.appendChild(workDocument.getElementById("style"));
+
+        test( function () {
+            assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--c").trim(), "rgb(0, 136, 0)");
+        }, "Variable definition appearing in a created document should work once spliced into the creating document");
+
+        test( function () {
+            assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(), "rgb(0, 136, 0)");
+        }, "Variable reference appearing in a created document should work once spliced into the creating document");
+
+    </script>
+</body>
+</html>
+