I used point a while ago, but changed it to pixels because there is a flaw in Firefox. When setting the font size in windows to 125% or more. IE scales the font based on windows settings, while Firefox ignores the windows settings and displays the font with the point size defined.
To get a consistent layout regardless of browser and windows settings it's better to use pixels.
Haven't tested it for Firefox 4.x yet, but there are still so many ppl using older Firefox versions, I think it will not change soon.
Sable
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