postcss-normalize-timing-functions is a PostCSS plugin that standardizes CSS timing functions, ensuring cross-browser compatibility and consistent animations. It converts vendor-prefixed timing functions like -webkit-animation to their standard counterparts where possible. The plugin also provides a simplified syntax for common cubic bezier curves, making CSS animations more readable and maintainable. By normalizing these functions, postcss-normalize-timing-functions improves the predictability and uniformity of animation behavior across different browsers.