aaa

<html>
    <head>
    <title> Deneme Deneme </title>
    <style>
        colgroup col:hover
        {
            background:red;
        }
    </style>
    </head>
    <body>
        <table>

        <colgroup>
            <col id="saffet"/>
            <col id="iki"/>
            <col id="uc"/>
        </colgroup>
            <thead>
            <tr>
                <th onmousemove="document.getElementById('saffet').style.backgroundColor = 'red'" onmouseout="document.getElementById('saffet').style.backgroundColor = 'white'">Bask1</th>
                <th onmousemove="document.getElementById('iki').style.backgroundColor = 'red'" onmouseout="document.getElementById('iki').style.backgroundColor = 'white'">Bask1</th>
                <th onmousemove="document.getElementById('uc').style.backgroundColor = 'red'" onmouseout="document.getElementById('uc').style.backgroundColor = 'white'">Bask1</th>
            </tr>
            </thead>

            <tr>
                <td onmousemove="document.getElementById('saffet').style.backgroundColor = 'red'" onmouseout="document.getElementById('saffet').style.backgroundColor = 'white'">ahan 1</td>
                <td onmousemove="document.getElementById('iki').style.backgroundColor = 'red'" onmouseout="document.getElementById('iki').style.backgroundColor = 'white'">ahan 1</td>
                <td onmousemove="document.getElementById('uc').style.backgroundColor = 'red'" onmouseout="document.getElementById('uc').style.backgroundColor = 'white'">ahan 1</td>
            </tr>
             <tr>
                <td onmousemove="document.getElementById('saffet').style.backgroundColor = 'red'" onmouseout="document.getElementById('saffet').style.backgroundColor = 'white'">ahan 1</td>
                <td onmousemove="document.getElementById('iki').style.backgroundColor = 'red'" onmouseout="document.getElementById('iki').style.backgroundColor = 'white'">ahan 1</td>
                <td onmousemove="document.getElementById('uc').style.backgroundColor = 'red'" onmouseout="document.getElementById('uc').style.backgroundColor = 'white'">ahan 1</td>
            </tr>
             <tr>
                <td onmousemove="document.getElementById('saffet').style.backgroundColor = 'red'" onmouseout="document.getElementById('saffet').style.backgroundColor = 'white'">ahan 1</td>
                <td onmousemove="document.getElementById('iki').style.backgroundColor = 'red'" onmouseout="document.getElementById('iki').style.backgroundColor = 'white'">ahan 1</td>
                <td onmousemove="document.getElementById('uc').style.backgroundColor = 'red'" onmouseout="document.getElementById('uc').style.backgroundColor = 'white'">ahan 1</td>
            </tr>
        </table>
    </body>
</html>