Success Criterion 2.5.4
Conformance level A
W3C reference F106

Shake or Tilt Control With No Way to Turn It Off

2.5.4 — Motion Actuation

Scenario

Setting

A streaming music app's search results

What’s wrong

A shake/tilt-controlled feature can't be switched off — users with tremors trigger it accidentally, and users who can't move the device can't use it.

Example

window.addEventListener('devicemotion', undoLastAction); // shake-only

Why it matters

People with tremor and people whose device cannot be moved freely.

How to test

Trigger the motion-activated feature (shake, tilt), then check device/app settings for a way to turn it off: if no such setting exists, it fails.

How to fix

Add a UI control for the motion feature and a setting to turn motion input off. window.addEventListener('devicemotion', undoLastAction); // plus a visible Undo button doing the same thing Motion-triggered actions need a standard UI control alternative, and a way to turn motion actuation off.

Outcome

On a streaming music app's search results, this barrier is gone for people with tremor and people whose device cannot be moved freely — they no longer have to work around this.

Who is affected