ブラウザ毎のデフォルトのフォントサイズと、パーセントでサイズ指定するための一覧をメモっておきます。

Windows

ブラウザ	プロポーショナル（Proportional）	等幅（Monospace）
Internet Explorer 8.0	16px	16px
Internet Explorer 7.0	16px	16px
Internet Explorer 6.0	16px	16px
Internet Explorer 4.0	16px	-
Firefox 3.0	16px	16px
Firefox 2.0	16px	16px
Firefox 1.0	16px	16px
Opera 9.0	16px	16px
Opera 9.0	16px	-
Safari 3.0	16px	13px
Netscape 7	16px	16px

Macintosh

ブラウザ	プロポーショナル（Proportional）	等幅（Monospace）
Safari 1.2.4	16px	13px
Firefox 3.0	16px	16px
Firefox 2.0	14px	14px
Firefox 1.0	14px	14px
Opera 9.0	16px	16px
Opera 8.0	16px	16px
Netscape 7	14px	14px
Internet Explorer 5.2	16px	16px

パーセント表記での指定値

フォントサイズ（px）	パーセント指定値（%）	表示サイズ（px）
12px	84%	10px
12px	92%	11px
12px	100%	12px
12px	109%	13px
12px	117%	14px
12px	125%	15px
12px	134%	16px
12px	142%	17px
12px	150%	18px
12px	159%	19px
12px	167%	20px
12px	175%	21px
12px	184%	22px
12px	192%	23px
12px	200%	24px
12px	209%	25px
12px	217%	26px
13px	77%	10px
13px	85%	11px
13px	93%	12px
13px	100%	13px
13px	108%	14px
13px	116%	15px
13px	124%	16px
13px	131%	17px
13px	139%	18px
13px	147%	19px
13px	154%	20px
13px	162%	21px
13px	170%	22px
13px	177%	23px
13px	185%	24px
13px	193%	25px
13px	200%	26px
14px	72%	10px
14px	79%	11px
14px	86%	12px
14px	93%	13px
14px	100%	14px
14px	108%	15px
14px	115%	16px
14px	122%	17px
14px	129%	18px
14px	136%	19px
14px	143%	20px
14px	150%	21px
14px	158%	22px
14px	165%	23px
14px	172%	24px
14px	179%	25px
14px	186%	26px
15px	67%	10px
15px	74%	11px
15px	80%	12px
15px	87%	13px
15px	94%	14px
15px	100%	15px
15px	107%	16px
15px	114%	17px
15px	120%	18px
15px	127%	19px
15px	134%	20px
15px	140%	21px
15px	147%	22px
15px	154%	23px
15px	160%	24px
15px	167%	25px
15px	174%	26px
16px	63%	10px
16px	69%	11px
16px	75%	12px
16px	82%	13px
16px	88%	14px
16px	94%	15px
16px	100%	16px
16px	107%	17px
16px	113%	18px
16px	119%	19px
16px	125%	20px
16px	132%	21px
16px	138%	22px
16px	144%	23px
16px	150%	24px
16px	157%	25px
16px	163%	26px

以下はreset.cssの片隅にでもメモっておく用です。あまり使わないかも知れないけど。


/* font-size
-------------------------------------------------- *//*

12px * 84% -> 10px
12px * 92% -> 11px
12px * 100% -> 12px
12px * 109% -> 13px
12px * 117% -> 14px
12px * 125% -> 15px
12px * 134% -> 16px
12px * 142% -> 17px
12px * 150% -> 18px
12px * 159% -> 19px
12px * 167% -> 20px
12px * 175% -> 21px
12px * 184% -> 22px
12px * 192% -> 23px
12px * 200% -> 24px
12px * 209% -> 25px
12px * 217% -> 26px

13px * 77% -> 10px
13px * 85% -> 11px
13px * 93% -> 12px
13px * 100% -> 13px
13px * 108% -> 14px
13px * 116% -> 15px
13px * 124% -> 16px
13px * 131% -> 17px
13px * 139% -> 18px
13px * 147% -> 19px
13px * 154% -> 20px
13px * 162% -> 21px
13px * 170% -> 22px
13px * 177% -> 23px
13px * 185% -> 24px
13px * 193% -> 25px
13px * 200% -> 26px

14px * 72% -> 10px
14px * 79% -> 11px
14px * 86% -> 12px
14px * 93% -> 13px
14px * 100% -> 14px
14px * 108% -> 15px
14px * 115% -> 16px
14px * 122% -> 17px
14px * 129% -> 18px
14px * 136% -> 19px
14px * 143% -> 20px
14px * 150% -> 21px
14px * 158% -> 22px
14px * 165% -> 23px
14px * 172% -> 24px
14px * 179% -> 25px
14px * 186% -> 26px

15px * 67% -> 10px
15px * 74% -> 11px
15px * 80% -> 12px
15px * 87% -> 13px
15px * 94% -> 14px
15px * 100% -> 15px
15px * 107% -> 16px
15px * 114% -> 17px
15px * 120% -> 18px
15px * 127% -> 19px
15px * 134% -> 20px
15px * 140% -> 21px
15px * 147% -> 22px
15px * 154% -> 23px
15px * 160% -> 24px
15px * 167% -> 25px
15px * 174% -> 26px

16px * 63% -> 10px
16px * 69% -> 11px
16px * 75% -> 12px
16px * 82% -> 13px
16px * 88% -> 14px
16px * 94% -> 15px
16px * 100% -> 16px
16px * 107% -> 17px
16px * 113% -> 18px
16px * 119% -> 19px
16px * 125% -> 20px
16px * 132% -> 21px
16px * 138% -> 22px
16px * 144% -> 23px
16px * 150% -> 24px
16px * 157% -> 25px
16px * 163% -> 26px

-------------------------------------------------- */