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@opena11y/apca

v0.1.0

Published

APCA Lc contrast for a text/background pair. npm @opena11y — not affiliated with OpenA11y on GitHub.

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@opena11y/apca

APCA lightness contrast (Lc) for a text/background pair.

npm @opena11y. Not affiliated with OpenA11y on GitHub.

Wraps apca-w3. Do not reimplement the formula.

Evidence: apca. Not WCAG 2 4.5:1. Not WCAG 3.

For agents

Text color first, background second. Do not swap.

import { apca } from "@opena11y/apca";

apca("#111", "#fff");
// { lc: 105, polarity: "BoW", evidence: "apca", ... }

Negative lc is light text on a dark background (WoB).

CLI:

opena11y apca <text> <background>
opena11y apca <url> --selector <css>

Do not report this as WCAG AA or as an axe pass.

For humans

Perceptual contrast for self-illuminated displays. Use when WCAG 2 ratios look fine but type still fails to read (grey-on-grey).