Originally Posted by Sirdude
while pt = 1/72inch which is absolute.

so, if you really want to be EXACT same size on any monitor, you use pt over px.

Sorry to disagree but I believe that EM is the way to go to allow the user to change font size based on their own eyesight/preference. Using one of the fixed methods does not lend itself to WAI conformance.

I could be wrong but this site should have more information on the subject.

http://www.w3.org/WAI/