If you need to use the font tag for changing fonts you should never give only one font name in the font argument. Always give a few (comma separated, and the whole string of font names enclosed in " as in <font face="fantasy,Times New Roman,Courier New" ...>), ending with one of the most common like Times New Roman, Arial, Courier New.
The browser will use the first font in the list which is installed so for those machines which have the font you want it makes no difference if there are a few more font names
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