A footer has the same goal as the header except it is located at the end of the content. You may have several footers in your HTML page. It can contain for sample a copyright note.
Usual attributes
Attribute name
Attribute value
class
Set a value for CSS rules. The CSS rule will be applied to all tags with the same class name
id
Set a unique value, it is useful for JavaScript or for CSS rule. For CSS it will be applied only for this tag
style
Set a CSS value. It has always priority for general CSS rules. Sample : "background-color:red;color:white"