A <colgroup> element that specifies that the first column should have a predefined width of 200 pixels:
The width attribute specifies the width of a column group.
Normally, a column group takes up the space it needs to display the content. The width attribute is used to set a predefined width of a column group.
Note: This attribute will be overwritten by any width set by <col> elements.
The width attribute is supported in all major browsers. However, none of the browsers support the relative_length value.
The width attribute of <colgroup> is not supported in HTML5. Use CSS instead.
CSS syntax: <td style="width:200px">
In our CSS tutorial you can find more details about the width property.
|pixels||Sets the width in pixels (example: width="50")|
|%||Sets the width in percent of the surrounding element (example: width="50%")|
|relative_length||Shares the available pixels into parts. (e.g. A table is 100 px, the first column group is
20 px, the second is 50%, the available pixels will then be 30px). One part is set like this: "1*".
Example: If 30 px of space are available, you can have one "1*" and one "2*", which will be interpreted as 10 and 20 px (think of 1* as one part, and 2* as two parts).