WCAG 2.1·Operable·2.3 Seizures and Physical Reactions

2.3.3 Animation from Interactions

Level AAA

Motion triggered by interaction must be disable-able (or honor prefers-reduced-motion).

Why it matters

Parallax scrolling, slide transitions, and similar can trigger vestibular disorders.

Common failure

body { animation: bounce 1s infinite; }

Accessible version

@media (prefers-reduced-motion: reduce) {
  body { animation: none; }
}

Automatically remediated. OnlyEnable patches this at runtime on every page load.