In order for any text to appear, someone somewhere has to have chosen a font face and size. So choosing to use relative rather than absolute units for font size moves where the decision occurs.
If the stylesheet belonging to the page uses an absolute unit like pt to set the size of the base font, the browser will attempt to use the page's stylesheet to set the default font size.
If the stylesheet belonging to the page instead uses the relative unit % or ems to set the size of the base font, then the browser will set the default font size relative to the local machine's default stylesheet's font size. Here 1 em behaves the same way as 100%.
If the stylesheet belonging to the page instead uses the relative unit px to set the size of the base font, then the browser will set the default font size relative to the local machine's resolution.
If the remainder of the font-sizes in the stylesheet are set with relative units, the page should retain the size relationships of the page's stylesheet no matter where the decision about default font size occurs.
Mary Krieger Winnipeg MB Canada
http://www.mts.net/~mkrieger/
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