Skip to content
master
Switch branches/tags
Code

Latest commit

 

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

wcag color contrast

CircleCI

This module produces WCAG contrast ratio measurement and scoring. It's an accessibility standard, intended to make sure websites have high enough contrast to be readable by everyone, including people with low vision and age-related vision problems. This module is a low-level utility, useful for its implementation of the underlying math: to test a page, you'll want to use something like Google Chrome’s Lighthouse tools, or the axe extension for Chrome and Firefox.

I (personally, speaking as Tom) have doubts about the universality, accuracy, and application of this particular standard. High contrast is a good value, but I argue that the standard is over-strict and doesn't precisely match human perception.

API

luminance

Get the contrast ratio between two relative luminance values

Parameters

Examples

luminance(1, 1); // = 1

Returns number contrast ratio

rgb

Get a score for the contrast between two colors as rgb triplets

Parameters

Examples

rgb([0, 0, 0], [255, 255, 255]); // = 21

Returns number contrast ratio

hex

Get a score for the contrast between two colors as hex strings

Parameters

Examples

hex('#000', '#fff'); // = 21

Returns number contrast ratio

score

Get a textual score from a numeric contrast value

Parameters

Examples

score(10); // = 'AAA'

Returns string score

About

WCAG contrast ratio measurement and scoring

Resources

License

Packages

No packages published