Font size values in various IM clients and web browsers

I collected these data on my own with the help of my friends Charlie and Tom. The table shows how different programs interpret different font sizes, both relative (like <font size="+3">) and absolute (like <font size="5">).

			Chat Clients						Web Browsers
			AIM 5.5		iChat 2.1 Beta	gaim 0.75	Trillian Pro 2.0		Mozilla 1.6, Firefox 0.8	Safari 1.2		Internet Explorer 6	Internet Explorer 5.2		iCab 2.9.7	Opera 6.03
HTML Font Size	... -3	... 0	Size 8	Size 4	Size 9	N/A*	Size 12**	Size 12**	Size 8	Size 7.5	N/A*	Size 7	Size 7	N/A*	Size 7	Size 7.75
	-2	1	Size 8		Size 9	Size 8	Size 12**	Size 8	Size 8	Size 7.5		Size 7	Size 7.75		Size 8	Size 7.75
	-1	2	Size 10		Size 10	Size 10	Size 12**	Size 10	Size 9	Size 10		Size 10	Size 10		Size 9	Size 10
	+0	3	Size 4	Size 12	Size 12	Size 12	Size 12	Size 12	Size 11	Size 12		Size 12	Size 12		Size 12	Size 12
	+1	4	Size 14		Size 14	Size 14	Size 8	Size 14	Size 13	Size 14		Size 14	Size 13.5		Size 14	Size 13.5
	+2	5	Size 18		Size 18	Size 20	Size 10	Size 18	Size 18	Size 18		Size 18	Size 18		Size 16	Size 18
	+3	6	Size 24		Size 24	Size 30	Size 12	Size 24	Size 22	Size 24		Size 24	Size 24		Size 21	Size 24
	+4	7	Size 38		Size 36	Size 40	Size 14	Size 38	Size 32	Size 36		Size 36	Size 36		Size 35	Size 36
	+5 ...	8 ...	Size 38		Size 36	Size 40	Size 18	Size 12**	Size 32	Size 36		Size 36	Size 36		Size 35	Size 36

* Safari, IE for Mac, and gaim ignore some font sizes, reverting to the user's default size preference.
** Trillian shows text with an unrecognized font size as size 12, no matter what the user's preference is.

If I've made any mistakes, or you have a new IM client or browser to add, or a new version of one already on the list, please send me an email.

-Keith Lea