HTML <colgroup> tag represents a group of one or more columns inside table.
HTML colgroup is a group of <col> tag to apply formatting such as width, text align, styles to entire columns instead of repeating for each cell of each row for a table.
Note: <colgroup> tag mostly supported in all major browsers.
Sample Code
<caption>Numbers Test</caption>
<colgroup>
<col width="50%" span="1">
<col width="50%" span="1">
</colgroup>
<tr>
<th>Numbers</th>
<th>Numbers in Words</th>
</tr>
<tr>
<td>1</td>
<td>One</td>
</tr>
<tr>
<td>2</td>
<td>Two</td>
</tr>
<tr>
<td>3</td>
<td>Three</td>
</tr>
</table>
Sample Result
| Numbers | Numbers in Words |
|---|---|
| 1 | One |
| 2 | Two |
| 3 | Three |
Tag Specific Attributes Support
Following are few colgroup tag attributes that are supported by <colgroup> tag.
| Attribute | Value | Description |
|---|---|---|
| align | center left right justify |
Represents the alignment of the col tag |
| span | number | Represents the number of columns for a col tag |
| width | pixels % |
Represents the width of the col tag |
Standard Attributes Support
HTML <colgroup> tag supports mostly all HTML Attributes. Following are some most common attributes that are used by <colgroup> tag. You can get more details about available HTML Attributes here.
| Attribute | Value | Description |
|---|---|---|
| class | user_defined | Represents a style for an element which is used in CSS style sheet |
| id | user_defined | Represents unique id for an element |
| lang | lang_code | Represents the language of the element for it’s content |
| style | css_properties | Represents an inline style for an element for e.g style=”color:red;text-decoration:underline;” |
| title | user_defined | Represents a tooltip information for an elements like img, a, abbr etc |
Event Attributes Support
The “script” is invoked when a certain “event” occurs. Each event handler content attribute deals with a different event. HTML <colgroup> tag supports mostly all HTML Event Attributes. Following are some most common event attributes that are used by <colgroup> tag. You can get more details about available HTML Event Attributes here.
| Attribute | Value | Description |
|---|---|---|
| onclick | script | Event Fires immediately when mouse click on the specified element |
| ondblclick | script | Event Fires immediately when mouse double-click on the specified element |
| onkeydown | script | Event Fires immediately when user is pressing a down key from keyboard |
| onkeypress | script | Event Fires immediately when user presses a key from keyboard |
| onkeyup | script | Event Fires immediately when user releases a key from keyboard |
| onmousedown | script | Event Fires immediately when mouse pointer gets down from an element |
| onmousemove | script | Event Fires immediately when mouse pointer moves over an element |
| onmouseout | script | Event Fires immediately when mouse pointer gets out from an element |
| onmouseover | script | Event Fires immediately when mouse pointer moves over an element |
| onmouseup | script | Event Fires immediately when a mouse pointer is released over an element |
