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diff --git a/testing/web-platform/tests/dom/nodes/getElementsByClassName-14.htm b/testing/web-platform/tests/dom/nodes/getElementsByClassName-14.htm
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+++ b/testing/web-platform/tests/dom/nodes/getElementsByClassName-14.htm
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+<!-- quirks mode -->
+<html class="a A">
+ <head>
+  <title>document.getElementsByClassName(): case-insensitive (quirks mode)</title>
+  <link rel="help" href="https://dom.spec.whatwg.org/#concept-getelementsbyclassname">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+ </head>
+ <body class="a a">
+  <div id="log"></div>
+  <div class="k"></div>
+  <div class="K"></div>
+  <div class="&#x212a;" id="kelvin"></div>
+  <script>
+test(function() {
+  assert_array_equals(document.getElementsByClassName("A a"),
+                      [document.documentElement, document.body]);
+})
+
+test(function() {
+  assert_array_equals(document.getElementsByClassName("\u212a"),
+                      [document.getElementById("kelvin")]);
+}, 'Unicode-case should be sensitive even in quirks mode.');
+  </script>
+ </body>
+</html>