# CSS pixel

The web's unit of length, not a screen's physical pixel.

**Source:** “The requirement is for targets to be at least 24 by 24 CSS pixels in size” [Understanding SC 2.5.8: Target Size (Minimum) (W3C)](https://www.w3.org/WAI/WCAG22/Understanding/target-size-minimum.html)

See also: [Target size](/reference/glossary/target-size).

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Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/glossary/css-pixel