The SUP element defines super-scripted text which appears as half the
size of the surrounding text and aligned at the top of the surrounding
A closing tag is require for this element.
||Identifies this tag to reference in script (program code)
||Define the class used to render this element (defined by a style sheet)
||A title that is associated with the element (displayed as a tooltip in Internet Explorer)
||Defines an inline style which may contain any CSS style properties you want
to apply to the contents of the SUB element.
area = π * r<SUP>2</SUP>
area = π * r2