| Unit | Relative To |
|---|---|
| rem | font size of root element |
| rem | font size of root element |
| em | font size of element, but can inherit from parent |
| em | font size of element, but can inherit from parent |
| ex | font height of "x" character of element, but can inherit from parent |
| ex | font height of "x" character of element, but can inherit from parent |
| ch | font width of "0" character of element, but can inherit from parent |
| ch | font width of "0" character of element, but can inherit from parent |
Font sizes and square sizes must be set.
Only inputs between 0 and 10 are accepted for font and square sizes. Lengths cannot be negative, and for display purposes we are setting the maximum value to 10.