HTML table headers are used to define the columns or rows of a table. They are typically styled differently from data cells to visually distinguish them.

Basic Usage

<table>
  <tr>
    <th>Header 1</th>
    <th>Header 2</th>
    <th>Header 3</th>
  </tr>
  <tr>
    <td>Cell 1</td>
    <td>Cell 2</td>
    <td>Cell 3</td>
  </tr>
</table>

In the example above, <th> tags are used to create the table headers.

Styling Headers

You can style table headers using CSS properties like:

• font-weight: Sets the font weight (e.g., bold).
• text-align: Sets the text alignment (e.g., center).
• background-color: Sets the background color.
• color: Sets the text color.

Example with Styling

<table>
  <tr>
    <th style="font-weight: bold; text-align: center; background-color: #f2f2f2;">Header 1</th>
    <th style="font-weight: bold; text-align: center; background-color: #f2f2f2;">Header 2</th>
    <th style="font-weight: bold; text-align: center; background-color: #f2f2f2;">Header 3</th>
  </tr>
  <tr>
    <td>Cell 1</td>
    <td>Cell 2</td>
    <td>Cell 3</td>
  </tr>
</table>

Header Scope

The scope attribute of the <th> element can be used to specify the scope of a header. This information is helpful for screen readers and assistive technologies.

• col: Indicates that the header is related to a column.
• row: Indicates that the header is related to a row.

Example with Scope

<table>
  <thead>
    <tr>
      <th scope="col">Header 1</th>
      <th scope="col">Header 2</th>
      <th scope="col">Header 3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Cell 1</td>
      <td>Cell 2</td>
      <td>Cell 3</td>   
    </tr>
  </tbody>
</table>

The <thead>, <tbody>, and <tfoot> Elements

• <thead>: Contains the table header rows.
• <tbody>: Contains the table body rows.
• <tfoot>: Contains the table footer rows.

By using these elements and styling techniques, you can create visually appealing and informative table headers that enhance the readability and usability of your HTML tables.