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diff --git a/testing/web-platform/tests/css/css-syntax/cdc-vs-ident-tokens.html b/testing/web-platform/tests/css/css-syntax/cdc-vs-ident-tokens.html
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index 0000000000..02cfbe11ae
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+++ b/testing/web-platform/tests/css/css-syntax/cdc-vs-ident-tokens.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>CDC versus Ident Token</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+-->
+
+--foo { color: blue; }
+
+</style>
+
+<meta name=author content="Tab Atkins-Bittner">
+<link rel=help href="https://drafts.csswg.org/css-syntax/#consume-token">
+
+<!--
+The ordering of the checks in the HYPHEN-MINUS step is important;
+if you get it wrong, ident-token can swallow cdc-token.
+-->
+
+<script>
+
+test(()=>{
+    const rule = document.styleSheets[0].cssRules[0];
+    assert_equals(rule.selectorText, "--foo");
+}, "CDC-token is properly emitted, and not parsed as an ident.");
+
+</script>