常用 font-size 值
大多数浏览器默认字体大小为16px------------------------------------------------CSS em px % title------------------------------------------------xx-small 0.50em 8px 50% 0.57em 9px 57%x-small 0.63em 10px 63% h6 0.69em 11px 69% 0.75em 12px 75%small 0.82em 13px 82% h5 0.88em 14px 88% 0.94em 15px 94%mediue 1em 16px 100% h4 1.08em 17px 108%large 1.13em 18px 113% h3 1.17em 19px 117% 1.25em 20px 125% 1.38em 22px 138%x-large 1.50em 24px 150% h2 1.75em 28px 175%xx-large 2em 32px 200% h1------------------------------------------------
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