<col> tag in HTML
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 in <col> tag
span attribute specify how many consecutive columns will be affected.
The column count goes from left to right.
Default value is 1.
Example - span attribute default value is 1
To see how the above example work in detail, Click Here