The <col> tag is used to modify styles in columns.
This tag becomes useful when there's a need to assign a set of attributes to the specified columns.
In such case, the attributes can be declared directly into the <col> element and their effect will be automatically transferred to the columns it represents.
The <col> tag must be defined inside the <colgroup> tag.
span attribute specify how many consecutive columns will be affected.
The column count goes from left to right.
Default value is 1.
To see how the above example work in detail, Click Here