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visible and hidden selector in jquery

Code :

 <button>Show hidden to see they don't change</button>

        <div></div>
        <div class="starthidden"></div>
        <div></div>
        <div></div>
        <div style="display: none;"></div>

    <style type="text/css">
        div
        {
            width: 50px;
            height: 40px;
            margin: 5px;
            border: 3px outset green;
            float: left;
        }

        .starthidden
        {
            display: none;
        }
    </style>


 <script type="text/javascript">
        $(document).ready(function () {
            $("div:visible").click(function () {
                $(this).css("background", "yellow");
            });
            $("button").click(function () {             
                $("div:hidden").show("fast");
                return false;
            });
        });
    </script>

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