Dave Davies @davedavies.dev · Jan 23 Anyone who's been around accessibility for more than a week will know about WCAG's contrast requirements. I mean, there's tools which do all this for us but did you ever wonder what a 4.5:1 ratio actually means? Follow on for a plain English explanation!
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Colour contrast ratio measures the brightness difference between text and background. When we talk about a contrast ratio of 4.5:1, the lighter colour is 4.5 times brighter than the darker one. This isn't arbitrary - it's based on how our eyes perceive different levels of brightness.