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Web Accessibility Academy · Lesson

Vestibular Disorders and Parallax Risks

Understand why big motion harms some users.

The Balance System

Your inner ear runs a balance system called the vestibular system. When it misfires, ordinary screen motion can feel deeply wrong. 🌀

What a Disorder Feels Like

A vestibular disorder can turn a scrolling animation into dizziness, nausea, or a headache that lingers long after you look away.

All lessons in this course

  1. prefers-reduced-motion in CSS and JS
  2. Vestibular Disorders and Parallax Risks
  3. The Three-Flash Threshold for Seizures
  4. Pause, Stop, Hide for Auto-Moving Content
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