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diff --git a/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/disabled.html b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/disabled.html
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index 0000000000..142a12dd12
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+++ b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/disabled.html
@@ -0,0 +1,80 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Selector: pseudo-classes (:disabled)</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>
+<style>
+  #input4 {display:none;}
+</style>
+<div id="log"></div>
+<button id=button1 type=submit>button1</button>
+<button id=button2 disabled>button2</button>
+<input id=input1>
+<input id=input2 disabled>
+<input id=input3 readonly>
+<input id=input4>
+<select id=select1>
+ <optgroup label="options" id=optgroup1>
+  <option value="option1" id=option1 selected>option1
+</select>
+<select disabled id=select2>
+ <optgroup label="options" disabled id=optgroup2>
+  <option value="option2" disabled id=option2>option2
+</select>
+<textarea id=textarea1>textarea1</textarea>
+<textarea disabled id=textarea2>textarea2</textarea>
+<fieldset id=fieldset1></fieldset>
+<fieldset disabled id=fieldset2>
+  <legend><input type=checkbox id=club></legend>
+  <p><label>Name on card: <input id=clubname required></label></p>
+  <p><label>Card number: <input id=clubnum required pattern="[-0-9]+"></label></p>
+</fieldset>
+<label disabled></label>
+<object disabled></object>
+<output disabled></output>
+<img disabled/>
+<meter disabled></meter>
+<progress disabled></progress>
+
+<script>
+  testSelectorIdsMatch(":disabled", ["button2", "input2", "select2", "optgroup2", "option2", "textarea2", "fieldset2", "clubname", "clubnum"], "':disabled' should match only disabled elements");
+
+  document.getElementById("button2").removeAttribute("disabled");
+  testSelectorIdsMatch(":disabled", ["input2", "select2", "optgroup2", "option2", "textarea2", "fieldset2", "clubname", "clubnum"], "':disabled' should not match elements whose disabled attribute has been removed");
+
+  document.getElementById("button1").setAttribute("disabled", "disabled");
+  testSelectorIdsMatch(":disabled", ["button1", "input2", "select2", "optgroup2", "option2", "textarea2", "fieldset2", "clubname", "clubnum"], "':disabled' should also match elements whose disabled attribute has been set");
+
+  document.getElementById("button1").setAttribute("disabled", "disabled");
+  testSelectorIdsMatch(":disabled", ["button1", "input2", "select2", "optgroup2", "option2", "textarea2", "fieldset2", "clubname", "clubnum"], "':disabled' should also match elements whose disabled attribute has been set twice");
+
+  document.getElementById("input2").setAttribute("type", "submit"); // change input type to submit
+  testSelectorIdsMatch(":disabled", ["button1", "input2", "select2", "optgroup2", "option2", "textarea2", "fieldset2", "clubname", "clubnum"], "':disabled' should also match disabled elements whose type has changed");
+
+  var input = document.createElement("input");
+  input.setAttribute("disabled", "disabled");
+  testSelectorIdsMatch(":disabled", ["button1", "input2", "select2", "optgroup2", "option2", "textarea2", "fieldset2", "clubname", "clubnum"], "':disabled' should not match elements not in the document");
+
+  var fieldset = document.createElement("fieldset");
+  fieldset.id = "fieldset_nested";
+  fieldset.innerHTML = `
+    <input id=input_nested>
+    <button id=button_nested>button nested</button>
+    <select id=select_nested>
+      <optgroup label="options" id=optgroup_nested>
+        <option value="options" id=option_nested>option nested</option>
+      </optgroup>
+    </select>
+    <textarea id=textarea_nested>textarea nested</textarea>
+    <object id=object_nested></object>
+    <output id=output_nested></output>
+    <fieldset id=fieldset_nested2>
+      <input id=input_nested2>
+    </fieldset>
+  `;
+  document.getElementById("fieldset2").appendChild(fieldset);
+  testSelectorIdsMatch("#fieldset2 :disabled", ["clubname", "clubnum", "fieldset_nested", "input_nested", "button_nested", "select_nested", "textarea_nested", "fieldset_nested2", "input_nested2"], "':disabled' should match elements that are appended to a disabled fieldset dynamically");
+</script>