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diff --git a/editor/libeditor/tests/test_bug1352799.html b/editor/libeditor/tests/test_bug1352799.html
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+++ b/editor/libeditor/tests/test_bug1352799.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1352799
+-->
+<head>
+  <title>Test for Bug 1352799</title>
+  <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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1352799">Mozilla Bug 1352799</a>
+<p id="display"></p>
+<div id="content">
+<div id="input-container" style="display: none;">
+<input id="input" maxlength="1">
+</div>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 1352799 **/
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(() => {
+  var input = document.getElementById("input");
+
+  var inputcontainer = document.getElementById("input-container");
+  input.setAttribute("maxlength", 2);
+  inputcontainer.style.display = "block";
+
+  input.focus();
+
+  sendString("123");
+
+  is(input.value, "12", "value should be 12 with maxlength = 2");
+
+  input.value = "";
+  inputcontainer.style.display = "none";
+
+  window.setTimeout(() => {
+    input.setAttribute("maxlength", 4);
+    inputcontainer.style.display = "block";
+
+    input.focus();
+
+    sendString("45678");
+
+    is(input.value, "4567", "value should be 4567 with maxlength = 4");
+
+    inputcontainer.style.display = "none";
+
+    window.setTimeout(() => {
+      input.setAttribute("maxlength", 2);
+      inputcontainer.style.display = "block";
+
+      input.focus();
+
+      sendString("12");
+
+      todo_is(input.value, "45", "value should be 45 with maxlength = 2");
+
+      input.value = "";
+      inputcontainer.style.display = "none";
+
+      window.setTimeout(() => {
+        input.removeAttribute("maxlength");
+        inputcontainer.style.display = "block";
+
+        input.focus();
+
+        sendString("12345678");
+
+        is(input.value, "12345678", "value should be 12345678 without maxlength");
+
+        SimpleTest.finish();
+      }, 0);
+    }, 0);
+  }, 0);
+});
+</script>
+</pre>
+</body>
+</html>