| Category | Subject | Sinopsys | Description | Example/Values |
|---|---|---|---|---|
| 0 | 0 requires no unit | |||
| Relative Sizes | em | 1em equal to font size of parent (same as 100%) | ||
| Relative Sizes | ex | Height of lower case "x" | ||
| Relative Sizes | % | Percentage | ||
| Device-dependent | px | Pixels | ||
| Absolute Sizes | cm | Centimeters | ||
| Absolute Sizes | mm | Millimeters | ||
| Absolute Sizes | in | Inches | ||
| Absolute Sizes | pt | 1pt = 1/72in | ||
| Absolute Sizes | pc | 1pc = 12pt |