How to use CSS border-collapse?

CSS border-collapse is a property that allows you to control how the borders of adjacent cells in a table are displayed. When border-collapse is set to “collapse”, adjacent borders are merged into a single border, while when it is set to “separate”, the borders are displayed independently.

Here is a step-by-step tutorial on how to use border-collapse in CSS:

Step 1: Create a Table

The first step is to create a table in your HTML document. You can create a table using the <table> element, and define rows using the <tr> element, columns using the <td> element, and headers using the <th> element.

<table>
    <tr>
        <th>Codezi.pro</th>
        <th>Header 2</th>
        <th>Header 3</th>
    </tr>
    <tr>
        <td>Cell 1</td>
        <td>Cell 2</td>
        <td>Cell 3</td>
    </tr>
    <tr>
        <td>Cell 4</td>
        <td>Cell 5</td>
        <td>Cell 6</td>
    </tr>
</table>

Step 2: Add Borders to the Table

To add borders to the table, you can use the CSS border property. For example, the following CSS code adds a solid black border to the table and its cells:

table, th, td {
  border: 1px solid black;
}

Step 3: Use Border Collapse

To merge the borders of adjacent cells into a single border, you can use the CSS border-collapse property. For example, the following CSS code sets the border-collapse property to “collapse”:

table {
  border-collapse: collapse;
}

This will collapse the borders of adjacent cells into a single border, resulting in a cleaner and more streamlined table design.

Step 4: Use Border Spacing

If you prefer to have some space between the borders of adjacent cells, you can use the CSS border-spacing property. For example, the following CSS code sets the border-spacing property to 10px:

table {
  border-collapse: separate;
  border-spacing: 10px;
}

This will display the borders of adjacent cells independently, but with a 10px space between them.

In conclusion, the border-collapse property in CSS allows you to control how the borders of adjacent cells in a table are displayed. By default, adjacent borders are displayed independently, but by setting the border-collapse property to “collapse”, you can merge them into a single border for a cleaner and more streamlined table design.