Text sizing in PoliteMail Online

When you use the sizing button to resize text in PoliteMail Online, the measurement shown is in pixels and not in points.  

There are 72 points in an inch, however 72 pixels may vary in size depending on the recipient's monitor resolution.  Most often, one pixel comes to roughly 1/96th of an inch, which means that making text, say, 16 pixels high is the rough equivalent of 12 points.