Anyone who has used it knows that the default styling for the HTML <sup> tag leaves a lot to be desired. The biggest is that it modifies the line-height of the line on which it it rendered.
Here is some CSS that fixes that behavior:
sup
{
height: 0;
line-height: 1px;
position: relative;
top: -0.6em;
vertical-align: baseline !important;
vertical-align: bottom;
}