<html>
    <head>
        <script>
            function enumerate(devices)
            {
                console.log("enumerateDevices succeeded");
            }

            function userMediaError(error)
            {
                console.log(error);
            }

            function test()
            {
                navigator.mediaDevices.enumerateDevices()
                    .then(enumerate)
                    .catch(userMediaError);
            }
        </script>
    </head>
    <body onload="test()">
    </body>
</html>