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+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Test: :focus-within selector</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://drafts.csswg.org/selectors-4/#focus-within-pseudo">
+    <meta name="assert" content="Test checks :focus-within should not work for iframe">
+    <link rel="match" href="focus-within-013-ref.html">
+    <style>
+      div:focus-within {
+        border: solid 15px red;
+      }
+      iframe:focus-within {
+        border: solid 15px red;
+      }
+    </style>
+  </head>
+  <body>
+    <p>Test passes if, when the element inside the iframe is focused, there is no red border surrounded.</p>
+    <div>
+      <iframe id="iframe" src="focus-within-1.html" width="300px" height="300px" frameborder="0" tabindex="1"><p>Your browser does not support iframes.</p></iframe>
+    </div>
+    <script>
+      var iframe = document.getElementById("iframe");
+      iframe.addEventListener("load", function() {
+        while (iframe.contentWindow.document.documentElement.classList.contains("reftest-wait")) {}
+        document.documentElement.classList.remove('reftest-wait');
+      });
+    </script>
+  </body>
+</html>