Returns as string with HTML <SUP> tags placed around text in a String object.
function sup() : String
No checking is done to see if the tag has already been applied to the string.
The following example demonstrates how the sup method works.
var strVariable = "This is a string object";
strVariable = strVariable.sup();
The value of strVariable after the last statement is:
<SUP>This is a string object</SUP>