copyright © CSSPG, lud October 04 1999

for practical use of CSS
The CSS1 Recommendation provides multiple methods for suggesting font sizes. Not all variations are supported equally by current implementations. These tests provide a means of gauging the rendering results of these suggestions. Selective fonts used are those which are available on the PC and iMac available to me. YMMV if the fonts are not available on your system.
font-family: cursive
xx-small
x-small
small
medium
large
x-large
xx-large
font-family: fantasy
xx-small
x-small
small
medium
large
x-large
xx-large
font-family: monospace
xx-small
x-small
small
medium
large
x-large
xx-large
font-family: sans-serif
xx-small
x-small
small
medium
large
x-large
xx-large
font-family: serif
xx-small
x-small
small
medium
large
x-large
xx-large
font-family: cursive
smaller
larger
font-family: fantasy
smaller
larger
font-family: monospace
smaller
larger
font-family: sans-serif
smaller
larger
font-family: serif
smaller
larger
font-family: monospace
5mm
10mm
font-family: sans-serif
.5cm
1cm
font-family: serif
20px
50px
font-family: cursive
.8pc
1pc
font-family: fantasy
8pt
12pt
font-family: monospace
.25in
.5in
font-family: serif
1em
2em
font-family: monospace
1ex
2ex
font-family: serif
120%
200%
font-family: sans-serif
90%
75%