Wave-to-Advance Camera Gesture With No Button Alternative

2.5.4 — Motion Actuation

Scenario

A ticket marketplace's seat-selection map

Camera-gesture (wave to advance) features lacking button equivalents or disable toggle.

handGestureModel.on('wave', () => {
  advanceToNextSection(); // camera-based gesture, with no button and no toggle
});

A user without a working camera, or who can't wave a hand in front of it, can never move past the first seating section.

Try to advance the feature via a button instead of a camera-detected wave gesture: if no button equivalent or disable toggle exists, it fails.

Camera gestures should always be optional extras layered on top of a plain button, never the only path.

<button aria-label="Next seating section" onclick="advanceToNextSection()">Next section</button>

A user taps 'Next section' and moves through the seat map without the camera involved.

Users with limited arm mobility, people in low light where camera gesture detection fails, and anyone without a front camera enabled.