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diff --git a/parser/htmlparser/tests/mochitest/test_bug566879.html b/parser/htmlparser/tests/mochitest/test_bug566879.html
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+++ b/parser/htmlparser/tests/mochitest/test_bug566879.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=566879
+-->
+<head>
+  <title>Test for Bug 566879</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body onload='runTest();'>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=566879">Mozilla Bug 566879</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<form>
+<input type=text id=textfield name=textfield>
+<input type=checkbox id=checkbox name=checkbox>
+<input type=radio id=radio1 name=radio>
+<input type=radio id=radio2 name=radio>
+<textarea name=textarea id=textarea></textarea>
+<select name=select id=select>
+<option value=foo>Foo</option>
+<option value=bar selected>Bar</option>
+</select>
+</form>  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+var initialState;
+
+function runTest() {
+  initialState = document.getElementById("content").innerHTML;
+  document.getElementById("textfield").value = "foo";
+  document.getElementById("checkbox").checked = true;
+  document.getElementById("radio2").checked = true;
+  document.getElementById("textarea").value = "foo";
+  document.getElementById("select").value = "foo";
+  setTimeout(continuation1, 1);
+}
+
+function continuation1() {
+  // eslint-disable-next-line no-unsanitized/property
+  document.getElementById("content").innerHTML = initialState;
+  setTimeout(continuation2, 1);
+}
+
+function continuation2() {
+  is(document.getElementById("textfield").value, "", "The text field should have gone back to its initial state.");
+  ok(!document.getElementById("checkbox").checked, "The checkbox should have gone back to its initial state.");
+  ok(!document.getElementById("radio2").checked, "The second radio button should have gone back to its initial state.");
+  is(document.getElementById("textarea").value, "", "The text area should have gone back to its initial state.");
+  is(document.getElementById("select").value, "bar", "The select should have gone back to its initial state.");
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+</script>
+</pre>
+</body>
+</html>
+