APCA independently reviewed, npm package now live

[Myndex]

Today I finally got the APCA npm package published

with the W3 licensed version of APCA, making it easier for developers to incorporate and keep it up to date.

And separately, by interesting coincidence,

Roger Attrill published an independent review of APCA in comparison to WCAG 2.

He includes a number of examples and discusses several aspects of the topic.

A

[Myndex]

APCA npm Package

The APCA npm package is available at: apca-w3

Install:

 npm i apca-w3

Usage:

And the API is trivially simple: send it two colors, it returns a signed INT of the Lc value (lightness contrast).

 Lc = APCAcontrast( sRGBtoY( textColor ), sRGBtoY( backgroundColor ) );

Implementation notes:

Color sent to the required parsing function sRGBtoY() can be a 3 or 6 character hex string #fff or a3b3d4 (hash # is optional but not required), a named CSS color (such as aquamarine), as rgb(99,122,14), or as a number 0x123456 or 15213412. Text color first, background color second — do not swap colors, as use case affects results. light text on a dark background returns a negative value.

For questions and comments please visit the main APCA repo discussion area.

Thank you!

Andy

[Myndex]