gecko-dev/dom/html/test/test_bug827426.html

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HTML

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=827426
-->
<head>
<title>Test for Bug 827426</title>
<script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.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=827426">Mozilla Bug 827426</a>
<p id="display"></p>
<div id="content">foo</div>
<pre id="test">
<script class="testbody" type="text/javascript">
/** Test for Bug 827426 **/
var elem = document.getElementById("content");
var undoManager = document.undoManager;
var transaction = {
executeAutomatic: function() {
elem.childNodes[0].appendData("bar");
},
};
// Perform transaction
undoManager.transact(transaction, false);
// Make mutation external to UndoManager.
elem.childNodes[0].deleteData(0, 6);
// Call undo/redo a few times and make sure nothing bad happens.
undoManager.undo();
undoManager.redo();
undoManager.undo();
undoManager.redo();
undoManager.undo();
ok(true, "Nothing bad happened with external mutation.");
</script>
</pre>
</body>
</html>