H02
Contrast check
WCAG 2.2 ratio with AA/AAA verdicts and an APCA reading, plus the nearest passing colour.
WHAT IT WILL NOT DO
- Two colours only — no size, weight or photo backdrop; for colour vision use H08.
- Accepts hex, rgb, hsl, oklch, oklab and eight names; full syntax in H01.
- APCA Lc values are still being revised; cite the WCAG column in an audit.