HTML 5 colgroup tag

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# HTML 5 <colgroup> tag

## Definition and Usage

Defines groups of table columns. With this element, you can group columns for formatting. This element is only valid inside the <table> tag.

## Differences Between HTML 4.01 and HTML 5

Most of the attributes from 4.01 are no longer supported

## Tips and Notes

Note: The colgroup element can only contain col elements.

Note: The colgroup element does not create columns. To create columns, you must specify td elements within a tr element.

Tip: Use this element if you want to specify the same attribute values to a group of columns.

Tip: Use the <col> element when you want to specify different attribute values to more than one table column.

## Example

Source | Output
--- | ---

<table>
<colgroup span="3" style="color:red">
</colgroup>
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
</tr>
</table>

1 | 2 | 3 | 4
1 | 2 | 3 | 4

## Attributes

- 4: indicates if the attribute is defined in HTML 4.01
- 5: indicates if the attribute is defined in HTML 5

Attribute | Value | Description | 4 | 5
--- | --- | --- | --- | ---
align | right left center justify char | Defines the horizontal alignment of the content in the table cell, in the column | 4 |
char | character | Defines a character to use to align text on (use with align="char") | 4 |
charoff | pixels % | Defines an alignment offset to the first character to align on, as set with char | 4 |
span | number | Defines the number of columns the <col> should span | 4 | 5
valign | top middle bottom baseline | Defines the vertical alignment of the content in the table cell, in the column | 4 |
width | % pixels relative_length | Defines the width of the column. Note: Overrides the width set in <colgroup> | 4 |

## Standard Attributes

class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title

For a full description, go to Standard Attributes in HTML 5.

## Event Attributes

onabort, onbeforeunload, onblur, onchange, onclick, oncontextmenu, ondblclick, ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop, onerror, onfocus, onkeydown, onkeypress, onkeyup, onload, onmessage, onmousedown, onmousemove, onmouseover, onmouseout, onmouseup, onmousewheel, onresize, onscroll, onselect, onsubmit, onunload

For a full description, go to Event Attributes in HTML 5.

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