From http://www.w3schools.com (Copyright Refsnes Data)

HTML 5 <col> tag


Definition and Usage

Defines the attribute values for one or more columns in a table. You can only use this element inside a table or a colgroup.


Differences Between HTML 4.01 and HTML 5

Most of the attributes from 4.01 are no longer supported


Tips and Notes

Note: The col element is an empty element. To create columns, you must specify td elements within a tr element.

Tip: Use this element when you want to specify different attribute values to more than one table column.

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


Example

Source Output
<table>
<col style="color:red" />
<col span="2" style="color:blue" />
<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

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.


From http://www.w3schools.com (Copyright Refsnes Data)