The HTML5 <col> tag is important in defining the properties for each column. It is used within a <colgroup> element. The use of HTML5 <col> tag is extensive because it allows uniformity in styles for each column. It is the key in avoiding the need to repeatedly define the styles for each cell within a row.

A lot of the attributes that are used for HTML4.01 <col> tag are no longer used for HTML5. The attributes for HTML5 <col> tags are the following:

The <col> tag is capable of supporting the Global Attributes and Event Attributes in HTML5. It is also recognized by the major web browsers like Safari, Google Chrome, Internet Explorer, Firefox and Opera.