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diff --git a/editor/libeditor/tests/test_set_document_title_transaction.html b/editor/libeditor/tests/test_set_document_title_transaction.html
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index 000000000..d745d4f13
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+++ b/editor/libeditor/tests/test_set_document_title_transaction.html
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+<!DOCTYPE html>
+<html>
+<head>
+  <title>Test for SetDocumentTitleTransaction</title>
+  <script type="text/javascript"
+          src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css"
+          href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+</head>
+<body onload="runTests()">
+<div id="display">
+  <iframe src="data:text/html,<!DOCTYPE html><html><head><title>first title</title></head><body></body></html>"></iframe>
+</div>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+function runTests() {
+  var iframe = document.getElementsByTagName("iframe")[0];
+  function isDocumentTitleEquals(aDescription, aExpectedTitle) {
+    is(iframe.contentDocument.title, aExpectedTitle, aDescription + ": document.title should be " + aExpectedTitle);
+    is(iframe.contentDocument.getElementsByTagName("title")[0].textContent, aExpectedTitle, aDescription + ": The text in the title element should be " + aExpectedTitle);
+  }
+
+  isDocumentTitleEquals("Checking isDocumentTitleEquals()", "first title");
+
+  const kTests = [
+    { description: "designMode=\"on\"",
+      init: function () {
+        iframe.contentDocument.designMode = "on";
+      },
+      cleanUp: function () {
+        iframe.contentDocument.designMode = "off";
+      }
+    },
+    { description: "html element has contenteditable attribute",
+      init: function () {
+        iframe.contentDocument.documentElement.setAttribute("contenteditable", "true");
+      },
+      cleanUp: function () {
+        iframe.contentDocument.documentElement.removeAttribute("contenteditable");
+      }
+    },
+  ];
+
+  for (var i = 0; i < kTests.length; i++) {
+    const kTest = kTests[i];
+    kTest.init();
+
+    var editor = SpecialPowers.wrap(iframe.contentWindow).
+                   QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor).
+                   getInterface(SpecialPowers.Ci.nsIWebNavigation).
+                   QueryInterface(SpecialPowers.Ci.nsIDocShell).editor;
+    ok(editor, kTest.description + ": The docshell should have editor");
+    var htmlEditor = editor.QueryInterface(SpecialPowers.Ci.nsIHTMLEditor);
+    ok(htmlEditor, kTest.description + ": The editor should have nsIHTMLEditor interface");
+
+    // Replace existing title.
+    htmlEditor.setDocumentTitle("Modified title");
+    isDocumentTitleEquals(kTest.description, "Modified title");
+
+    // When the document doesn't have <title> element, title element should be created automatically.
+    iframe.contentDocument.head.removeChild(iframe.contentDocument.getElementsByTagName("title")[0]);
+    is(iframe.contentDocument.getElementsByTagName("title").length, 0, kTest.description + ": There should be no title element");
+    htmlEditor.setDocumentTitle("new title");
+    is(iframe.contentDocument.getElementsByTagName("title").length, 1, kTest.description + ": There should be a title element");
+    isDocumentTitleEquals(kTest.description, "new title");
+
+    kTest.cleanUp();
+  }
+
+  SimpleTest.finish();
+}
+</script>
+</body>
+
+</html>