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diff --git a/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/required-optional.html b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/required-optional.html
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+++ b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/required-optional.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Selector: pseudo-classes (:required, :optional)</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>
+<div id="log"></div>
+<input type=text id=text1 value="foobar" required>
+<input type=text id=text2 required>
+<input type=text id=text3>
+<select id=select1 required>
+ <optgroup label="options" id=optgroup1>
+   <option value="option1" id=option1>option1
+</select>
+<select id=select2>
+ <optgroup label="options" id=optgroup2>
+   <option value="option2" id=option2>option2
+</select>
+<textarea required id=textarea1>textarea1</textarea>
+<textarea id=textarea2>textarea2</textarea>
+
+<script>
+  testSelectorIdsMatch(":required", ["text1", "text2", "select1", "textarea1"], "':required' matches required <input>s, <select>s and <textarea>s");
+  testSelectorIdsMatch(":optional", ["text3", "select2", "textarea2"], "':optional' matches elements <input>s, <select>s and <textarea>s that are not required");
+
+  document.getElementById("text1").removeAttribute("required");
+  testSelectorIdsMatch(":required", ["text2", "select1", "textarea1"], "':required' doesn't match elements whose required attribute has been removed");
+  testSelectorIdsMatch(":optional", ["text1", "text3", "select2", "textarea2"], "':optional' matches elements whose required attribute has been removed");
+
+  document.getElementById("select2").setAttribute("required", "required");
+  testSelectorIdsMatch(":required", ["text2", "select1", "select2", "textarea1"], "':required' matches elements whose required attribute has been added");
+  testSelectorIdsMatch(":optional", ["text1", "text3", "textarea2"], "':optional' doesn't match elements whose required attribute has been added");
+</script>