Infinite Auto-Scroll Marquee (Pure CSS, No JavaScript)

A seamless, infinitely-scrolling ticker/marquee for logo strips or tag clouds, built with one CSS @keyframes animation - no JavaScript, no library. The trick: the item list is duplicated once and the track animates translateX(0) to translateX(-50%), so the loop point is invisible. Pauses on hover/focus for readability, fades the edges with a mask-image, and respects prefers-reduced-motion.