10.2.2. Only use relative sizes (em, %, small, etc.) for typefaces
To define the size of character fonts, only use relative units for the CSS font-size property, such as em, %, px, rem, and the keywords x-small, small, etc.
Do not use absolute unit sizes, such as pt, cm, etc.
Warning
Due to its poor support in Internet Explorer, using pixels (px) as a unit of font size is not authorized in some guidelines such as the French guidelines AccessiWeb or RGAA. To ensure conformity with these guidelines, you must use a different unit of size for the font-size property.
Related recommendations
- Previous recommendation: 10.2.1. Use CSS to format text
- Next recommendation: 10.2.3. Ensure the readability of content even if the text size is doubled
