选择body基准文字大小（默认16px）
| Pixels |
EMs |
Percent |
Points |
| 6px | 0.375em | 37.5% | 5pt |
| 7px | 0.438em | 43.8% | 5pt |
| 8px | 0.500em | 50.0% | 6pt |
| 9px | 0.563em | 56.3% | 7pt |
| 10px | 0.625em | 62.5% | 8pt |
| 11px | 0.688em | 68.8% | 8pt |
| 12px | 0.750em | 75.0% | 9pt |
| 13px | 0.813em | 81.3% | 10pt |
| 14px | 0.875em | 87.5% | 11pt |
| 15px | 0.938em | 93.8% | 11pt |
| 16px | 1.000em | 100.0% | 12pt |
| 17px | 1.063em | 106.3% | 13pt |
| 18px | 1.125em | 112.5% | 14pt |
| 19px | 1.188em | 118.8% | 14pt |
| 20px | 1.250em | 125.0% | 15pt |
| 21px | 1.313em | 131.3% | 16pt |
| 22px | 1.375em | 137.5% | 17pt |
| 23px | 1.438em | 143.8% | 17pt |
| 24px | 1.500em | 150.0% | 18pt |
对应的em大小
| Pixels |
EMs |
Percent |
Points |
| 6px | 0.250em | 25.0% | 5pt |
| 7px | 0.292em | 29.2% | 5pt |
| 8px | 0.333em | 33.3% | 6pt |
| 9px | 0.375em | 37.5% | 7pt |
| 10px | 0.417em | 41.7% | 8pt |
| 11px | 0.458em | 45.8% | 8pt |
| 12px | 0.500em | 50.0% | 9pt |
| 13px | 0.542em | 54.2% | 10pt |
| 14px | 0.583em | 58.3% | 11pt |
| 15px | 0.625em | 62.5% | 11pt |
| 16px | 0.667em | 66.7% | 12pt |
| 17px | 0.708em | 70.8% | 13pt |
| 18px | 0.750em | 75.0% | 14pt |
| 19px | 0.792em | 79.2% | 14pt |
| 20px | 0.833em | 83.3% | 15pt |
| 21px | 0.875em | 87.5% | 16pt |
| 22px | 0.917em | 91.7% | 17pt |
| 23px | 0.958em | 95.8% | 17pt |
| 24px | 1.000em | 100.0% | 18pt |