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.

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

10.2.2. Only use relative sizes (em, %, small, etc.) for typefaces

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