PVH / WWW-WebKit2-0.133 / t / test / select.html 
<!DOCTYPE html>
<html>
    <head>
        <title>test</title>
        <script type="text/javascript">
            function test_onchange() {
                alert("onchange fired");
            }

            window.addEventListener('load', function() {
                document.getElementById('test_event').addEventListener('change', function () {
                    alert('change event fired');
                });
            });
        </script>
    </head>
    <body>
        <select id="test" name="foo" onchange="test_onchange()">
            <option value="0">0</option>
            <option value="1">1</option>
        </select>
        <select id="test_event" name="bar">
            <option value="0">0</option>
            <option value="1">1</option>
        </select>
    </body>
</html>