PVH / WWW-WebKit2-0.133 / t / test / check.html 
<html>
    <head>
        <title>test</title>
        <script>
            document.addEventListener("DOMContentLoaded", function() {
                document.querySelector('input[type="checkbox"]').checked = false;
            }, false);
        </script>
        <style>
            .hide { display: none; }
        </style>
    </head>
    <body>
        <form>
            <input type="checkbox" value="1" name="check_me"/>
        </form>
    </body>
</html>