[ Thanks to jmalasko for this link.
]
“Do Firefox3 and Internet Explorer 7 look different? What’s the
best way to get these browsers to behave the same way? Should you
use pixels or em values? Regular developerWorks author Judith M.
Myerson shows you how to standardize displays on Web portals
running on Firefox and IE. She gives tricks and tips for using em
values to make the job of developing the contents of portals,
including Asynchronous JavaScript + XML (Ajax) applications, much
easier.”