<!DOCTYPE html>
<html>
<head>
    <script type="text/javascript">
    function runTest()
    {
        if (window.testRunner)
            testRunner.dumpAsText();

        var doc = document.implementation.createDocument("", "", null);
        var parent = doc.firstChild;
        var element = doc.createElementNS("ns1", "x:y");
        element.setAttributeNS("ns2", "x:z", "val");
        element.setAttributeNS("ns3", "w", "val");
        doc.appendChild(element);
        var serializer = new XMLSerializer();
        var xmlString = serializer.serializeToString(doc);

        var outputText = document.getElementById("output");
        outputText.textContent = xmlString;
    }
    </script>
</head>
    <body onload="runTest()">
        <div id="target"/>
        <div id="output"/>
    </body>
</html>