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diff --git a/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/focus.html b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/focus.html
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+++ b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/focus.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Selector: pseudo-classes (:focus)</title>
+<link rel="author" title="Denis Ah-Kang" href="mailto:denis@w3.org" id=link1>
+<link rel=help href="https://html.spec.whatwg.org/multipage/#pseudo-classes" id=link2>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="utils.js"></script>
+<body id=body tabindex=0>
+  <div id="log"></div>
+  <button id=button1 type=submit>button1</button>
+  <input id=input1>
+  <input id=input2 disabled>
+  <textarea id=textarea1>textarea1</textarea>
+  <input type=checkbox id=checkbox1 checked>
+  <input type=radio id=radio1 checked>
+  <div tabindex=0 id=div1>hello</div>
+  <div contenteditable id=div2>content</div>
+  <iframe src="focus-iframe.html" id=iframe></iframe>
+
+  <script>
+    setup({explicit_done: true});
+
+    onload = function() {
+      if (document.hasFocus() || frames[0].document.hasFocus()) {
+        run_test()
+      } else {
+        window.onfocus = run_test;
+      }
+    }
+
+    function run_test() {
+      document.getElementById("input1").focus(); // set the focus on input1
+      testSelectorIdsMatch(":focus", ["input1"], "input1 has the focus");
+
+      document.getElementById("div1").focus();
+      testSelectorIdsMatch(":focus", ["div1"], "tabindex attribute makes the element focusable");
+
+      document.getElementById("div2").focus();
+      testSelectorIdsMatch(":focus", ["div2"], "editable elements are focusable");
+
+      document.body.focus();
+      testSelectorIdsMatch(":focus", ["body"], "':focus' matches focussed body with tabindex");
+
+      document.getElementById("iframe").contentDocument.getElementById("inputiframe").focus();
+      testSelectorIdsMatch(":focus", [], "':focus' doesn't match focused elements in iframe");
+
+      done();
+    }
+  </script>
+</body>