thanks Navneet for the query!
There are different font units available in CSS..
i) em: This is the default font size set in the users' browser preferences. It refers to the width of the letter m in the font used. Font sizes are determined relative to this initial measure.
ii) ex: This refers to the x-height of a font, or the size of the lowercase x in the font. Font sizes are determined relative to this initial measure.
iii) pixels (px): This refers to the number of pixels in the viewing device. Font sizes are determined relative to the viewing device resolution.
i hope this site wiil give more deatail about the topic:http://www.bigbaer.com/css_tutorials/css_font_size.htm
Aug 11, 2009
