<!DOCTYPE html>
      <html>
      <head>
      <style>
      table, th, td {
        border: 1px solid black;
        border-collapse: collapse;
      }
      </style>
      </head>
      <body>
      <h2>Colgroup</h2>
      <p>Add the a colgroup with a col element that spans over two columns to define a style for the two columns:</p>
      <table style="width: 100%;">
      <colgroup>
        <col span="2" style="background-color: #D6EEEE">
      </colgroup>
      <tr>
      <th>MON</th>
      <th>TUE</th>
      <th>WED</th>
      <th>THU</th>
      <th>FRI</th>
      <th>SAT</th>
      <th>SUN</th>
      </tr>
      <tr>
      <td>1</td>
      <td>2</td>
      <td>3</td>
      <td>4</td>
      <td>5</td>
      <td>6</td>
      <td>7</td>
      </tr>
      <tr>
      <td>8</td>
      <td>9</td>
      <td>10</td>
      <td>11</td>
      <td>12</td>
      <td>13</td>
      <td>14</td>
      </tr>
      <tr>
      <td>15</td>
      <td>16</td>
      <td>17</td>
      <td>18</td>
      <td>19</td>
      <td>20</td>
      <td>21</td>
      </tr>
      <tr>
      <td>22</td>
      <td>23</td>
      <td>24</td>
      <td>25</td>
      <td>26</td>
      <td>27</td>
      <td>28</td>
      </tr>
      </table>
      </body>
      </html>
      

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      HTML Table Colgroup

      HTML Table Colgroup

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