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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 with invalid syntax due to a variable reference having a '!' token at the top level of its fallback.</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/#syntax">
+<link rel="match" href="support/color-green-ref.html">
+<style>
+p {
+ color: red;
+ --a: green;
+ --b: crimson;
+ --a: var(--b,!);
+ color: var(--a);
+}
+</style>
+<p>This text must be green.</p>