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diff --git a/testing/web-platform/tests/css/selectors/missing-right-token.html b/testing/web-platform/tests/css/selectors/missing-right-token.html
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+++ b/testing/web-platform/tests/css/selectors/missing-right-token.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta id="expected" charset="utf-8">
+  <title>Selectors: attribute selectors with missing right token</title>
+  <link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+  <link rel="help" href="https://drafts.csswg.org/selectors-4/#attribute-selectors">
+  <link rel="help" href="https://drafts.csswg.org/css-syntax/#rule-defs">
+  <meta name="assert" content="Checks attribute selectors with missing right token are matched.">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+
+
+  <div id="container">
+    <span></span>
+    <span class="cls"></span>
+  </div>
+
+  <script>
+    test(() => {
+      assert_equals(document.querySelector('meta[charset="utf-8"'), expected);
+      assert_equals(document.querySelector('meta[charset="utf-8'), expected);
+
+      assert_equals(container.querySelectorAll('span:not([class]').length, 1);
+      assert_equals(container.querySelectorAll('span:not([class').length, 1);
+    }, "attribute selectors with missing right tokens succeed");
+  </script>
+</body>
+</html>