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+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<title>CSS Test: Test declaring a variable whose value consists of a reference to a variable whose value is "unset".</title>
+<link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
+<link rel="help" href="http://www.w3.org/TR/css-variables-1/#defining-variables">
+<link rel="match" href="support/color-green-ref.html">
+<style>
+body {
+  --b: green;
+  color: crimson;
+}
+p {
+  color: red;
+}
+p {
+  color: orange;
+  --a: var(--b);
+  --b: unset;
+  color: var(--a);
+}
+</style>
+<p>This text must be green.</p>