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diff --git a/editor/libeditor/tests/test_bug487524.html b/editor/libeditor/tests/test_bug487524.html
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index 0000000000..d4972ba91b
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+++ b/editor/libeditor/tests/test_bug487524.html
@@ -0,0 +1,65 @@
+<!DOCTYPE HTML>
+<html><head>
+<title>Test for bug 487524</title>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+<script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+
+<script class="testbody" type="application/javascript">
+function runTest() {
+
+  function setupIframe(e,html,focus_id) {
+    var doc = e.contentDocument;
+    doc.body.innerHTML = html;
+    doc.designMode = "on";
+    e = doc.getElementById(focus_id);
+    doc.defaultView.focus();
+    if (e) e.focus();
+    return e;
+  }
+
+  var i1 = document.getElementById('i1')
+  var li1 = setupIframe(i1,'<ul><li id="li1">one</li><li>two</li><ul><li>a</li></ul></ul>','li1')
+  var doc = li1.ownerDocument;
+
+  var selection = doc.defaultView.getSelection();
+  selection.removeAllRanges();
+
+  var range = doc.createRange();
+  range.setStart(li1,0);
+  range.setEnd(li1.nextSibling,0);
+  selection.addRange(range);
+
+  sendKey('delete');
+  is(doc.body.innerHTML,'<ul><li>two</li><ul><li>a</li></ul></ul>','delete 1st LI');
+
+  var li2 = setupIframe(i1,'<ul><li id="li2">two</li><ul><li>a</li></ul></ul>','li2')
+  selection = doc.defaultView.getSelection();
+  selection.removeAllRanges();
+
+  range = doc.createRange();
+  range.setStart(li2,0);
+  range.setEnd(li2.nextSibling.firstChild,0);
+  selection.addRange(range);
+
+  sendKey('delete');
+  is(doc.body.innerHTML,'<ul><ul><li>a</li></ul></ul>','delete 2nd LI');
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+</script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=487524">Mozilla Bug 487524</a>
+<p id="display"></p>
+
+<pre id="test">
+</pre>
+
+<iframe id="i1" width="200" height="100" src="about:blank"></iframe><br>
+
+</body>
+</html>