In a 2017 post, the Bureau of Internet Accessibility explains that the background colors of webpages, including highlighted text, might be perceived differently by users with visual impairments, and those with visual or cognitive disabilities might also have difficulty reading text at certain contrast levels.
A measure of the difference between foreground and background. For WCAG 3.0, a new method known as the Advanced Perceptual Contrast Algorithm provides a numeric contrast value relative to perception.
Interface components have a contrast ratio of 3:1, while the text is 4.5:1. Text requires a higher contrast because users need to read it. Interface components don’t require reading and have a lower standard.
Relative luminance and contrast ratio calculator
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