Styling HTML Table Columns with `` and ``

Learn to style individual columns in your HTML tables using the powerful `` and `` elements. This tutorial shows you how to apply CSS styles to specific columns, including background colors, borders, and width, and even how to hide columns. Includes practical examples!

Styling Table Columns with HTML `colgroup`

The HTML <colgroup> element allows you to apply styles to specific columns in an HTML table, enhancing visual organization and presentation.

Using `colgroup` and `col`

The <colgroup> element acts as a container for column specifications. Inside <colgroup>, you use one or more <col> elements, each defining styles for one or more columns.

The span attribute in <col> determines how many columns the style applies to. The style attribute contains the CSS rules.

Example: Styling the First Two Columns


<table>
  <colgroup>
    <col style="background-color:#f0f0f0;">
    <col style="background-color:#ddd;">
  <colgroup>
  <tr>
    <td>Data 1</td>
    <td>Data 2</td>
    <td>Data 3</td>
  </tr>
</table>

This styles the first two columns with different background colors.

Important Note: <colgroup> must be a child of <table> and placed *before* any other table elements (<thead>, <tbody>, <tfoot>, <tr>, etc.).

Allowed CSS Properties

Only a limited set of CSS properties are effective within the <col> element:

width
visibility
background properties (e.g., background-color)
border properties

Other CSS properties will be ignored.

Styling Multiple Columns with Different Styles

To style multiple columns with different styles, add multiple <col> elements within the <colgroup> element.

Example: Multiple Col Elements


<table>
  <colgroup>
    <col style="background-color:#f0f0f0;">
    <col style="background-color:#ddd;" span="2">
  </colgroup>
  <tr>
    <td>Data 1</td>
    <td>Data 2</td>
    <td>Data 3</td>
  </tr>
</table>

Styling Columns in the Middle of a Table

To style columns that aren't at the beginning of the table, you'll need empty <col> elements (without styles) to represent the columns you want to skip.

Example: Styling Middle Columns


<table>
  <colgroup>
    <col>
    <col>
    <col style="background-color:yellow;">
  </colgroup>
  <tr>
    <td>Data 1</td>
    <td>Data 2</td>
    <td>Data 3</td>
  </tr>
</table>

Hiding Columns

You can hide columns using the visibility: collapse; CSS property within the <col> style attribute.

Example: Hiding Columns


<col style="visibility:collapse;">

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