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How to merge table columns in HTML?
To merge table columns in HTML use the colspan attribute in <td> tag. With this, merge cells with each other. For example, if your table is having 4 rows and 4 columns, then with colspan attribute, you can easily merge 2 or even 3 of the table cells.

Example
You can try to run the following code to merge table column in HTML. Firstly, we will see how to create a table in HTML with 3 rows and 3 columns
<!DOCTYPE html> <html>    <head>       <style>          table, th, td {             border: 1px solid black;             width: 100px;             height: 50px;          }       </style>    </head>    <body>       <h1>Heading</h1>       <table>          <tr>             <th></th>             <th></th>             <th></th>          </tr>          <tr>             <td></td>             <td></td>             <td></td>          </tr>          <tr>             <td></td>             <td></td>             <td></td>          </tr>       </table>    </body> </html>  Output
Example
Let's merge columns using the colspan attribute. The first 2 columns will merge
<!DOCTYPE html> <html>    <head>       <style>          table, th, td {             border: 1px solid black;             width: 100px;             height: 50px;          }       </style>    </head>    <body>       <h1>Heading</h1>       <table>          <tr>             <th></th>             <th></th>             <th></th>          </tr>          <tr>             <td colspan="2"></td>             <td></td>          </tr>          <tr>             <td></td>             <td></td>             <td></td>          </tr>       </table>    </body> </html>  Output
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