BASEFONT is used to set a default font size. After you have set a base font any FONT tags using relative font sizes (such as FONT SIZE="+2") will use the base font value. The SIZE attribute is a whole number from 1 to 7. The base font size applies to any normal or preformatted text but not to any headings, unless they were created using the FONT tag. It can also set the BASEFONT color.
<BASEFONT COLOR="#ff0000">Red text.</BASEFONT>