contrast-color()

The CSS `contrast-color()` function automatically returns either black or white — whichever provides the highest contrast — for a given background color. Defined in CSS Color Module Level 5, it simplifies accessible color theming by eliminating the need to manually pair text and background colors. However, it has notable limitations: it only resolves to black or white, defaults to white when contrast is equal, doesn't account for font-size, and has limited browser support. A `@supports` fallback is recommended for production use. The function is still a work in progress and may not suit all design scenarios.