Text size: {font-size:12px/14px/16px;}
Note:
1) When the attribute value is a numeric value, a unit must be added to the attribute value, except when the attribute value is 0.
2) The unit can also be pt, 9pt=12px;
3) In order to reduce the font display differences between systems, the browser makers of IE Netscape Mozilla held a meeting in 1999 to jointly determine 16px/ppi as the standard font size default value. That is 1em. By default,
0.75em=12px;
1em=16px;
4) Use absolute size keywords
xx-small =9px
x-small =11px
small =13px
medium =16px
large =19px
x-large =23px
xx-large =27px
5) Specific case:
1in = 2.54cm = 25.4 mm = 72pt = 6pc
Points Pixels Ems Percent
6pt 8px 0.5em 50%
7pt 9px 0.55em 55%
7.5pt 10px 0.625em 62.5%
8pt 11px 0.7em 70%
9pt 12px 0.75em 75%
10pt 13px 0.8em 80%
10.5pt 14px 0.875em 87.5%
11pt 15px 0.95em 95%
12pt 16px 1em 100%
13pt 17px 1.05em 105%
13.5pt 18px 1.125em 112.5%
14pt 19px 1.2em 120%
14.5pt 20px 1.25em 125%
15pt 21px 1.3em 130%
16pt 22px 1.4em 140%
17pt 23px 1.45em 145%
18pt 24px 1.5em 150%
20pt 26px 1.6em 160%
22pt 29px 1.8em 180%
24pt 32px 2em 200%
26pt 35px 2.2em 220%
27pt 36px 2.25em 225%
28pt 37px 2.3em 230%
29pt 38px 2.35em 235%
30pt 40px 2.45em 245%
32pt 42px 2.55em 255%
34pt 45px 2.75em 275%
36pt 48px 3em 300%