Assertions:
Neither Internet Explorer or Netscape 1.0-4.x apply the BASEFONT SIZE attribute value to heading levels. Internet Explorer does apply the FACE and COLOR values to headings though.

Plain H3 element:

filler text

H3 element H3 element

filler text

H3 element enclosed in BASEFONT color=green:

filler text basefont color=green

H3 element H3 element

basefont color=green filler text

H3 element enclosed in BASEFONT face=verdana:

filler text basefont face=verdana

H3 element H3 element

basefont face=verdana filler text