| Unit | Abbr | Length | To Change |
|---|---|---|---|
| Width of capital M | em | M | Change font size. |
| Height of lowercase x | ex | x | Change font size. |
| Width of the number 0 | ch | 0 | Change font size. |
| Root em | rem | n/a | |
| 1/100th of Width of Viewport | vw | Change width of browser window. | |
| 1/100th of Height of Viewport | vh | Change height of browser window. | |
| 1/100th of Viewport's Smaller Dimension | vmin | Change height or width of browser window. | |
| 1/100th of Viewport's Larger Dimension | vmax | Change height or width of browser window. |
| Unit | Abbr | Length |
|---|---|---|
| Pixels | px | |
| Quarter millimeters | q | |
| Millimeters | mm | |
| Centimeters | cm | |
| Picas | pc | |
| Points | pt | |
| Inches | in |