superscript is leaving a big space between the line height.
code is
®&l
Outlook pads line-height when superscript is applied. One fix (with caveat!) is to do the following: apply
<style="mso-line-height-rule:exactly;">
to the <td>
IF there are no deviations in line-height in the cell AND no images used. !!!(that's important because Outlook 2010 will cut off images if this is applied) Then, apply
<span (or sup) style="font-size: (2px or more smaller than actual font size); line-height:0; vertical-align:3px;"
in the span tag wrapping the superscript.
SEE: http://emaildude.blogspot.com/2011/06/superscript-and-line-heights.html
I fixed this issue by increasing the line-height
of the containing paragraph <p>
I've made few experiments in jsFiddle and I think you will be able to use:
<sup style="line-height: 0">®</sup>
in firefox it does not increases the gap between the lines