font-size in percent

I hope this is the right place to ask this question. I'm making some
simple web pages in Word for XP. It is working well, except that in
IE 6, changing the font size doesn't change the size of the font. I
found out that if I manually replace font-size in points with
percentages, it worked correctly in IE. Is there a way in Word that I
can tell it to embed percentages for font-size so I won't have to make
the changes manually?
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