Behavior comparison

Reduced motion and fallback vs Spring animation

Decisive difference

Reduced motion and fallback addresses the same result without movement; Spring animation addresses a damped physical response. They can be combined when both needs apply.

Reduced motion and fallbackChoose Reduced motion and fallback if you need the same result without movement.
Spring animationChoose Spring animation if you need a damped physical response.

See the nine dimensions See the sources

Decision

Family question

Does motion explain a change, report state, or only decorate?

Nine dimensions

Dimension	Reduced motion and fallbackReduced motion and fallback	Spring animationSpring animation
Trigger	Explicit activation to demonstrate the same result without movement.	Explicit activation to demonstrate a damped physical response.
Modality	Non-modal; surrounding content stays usable.	Non-modal; surrounding content stays usable.
Placement	Inside a bounded specimen; no page-level decoration.	Inside a bounded specimen; no page-level decoration.
Interactivity	Adjust one parameter for the same result without movement; pause or use a static result.	Adjust one parameter for a damped physical response; pause or use a static result.
Focus	Focus stays on the activated control. Reset restores focus to its button.	Focus stays on the activated control. Reset restores focus to its button.
Dismissal	Pause freezes playback; static fallback cancels it. Leaving the specimen cancels its animation and removes listeners.	Pause freezes playback; static fallback cancels it. Leaving the specimen cancels its animation and removes listeners.
Accessible role	button + checkbox + status	button + select + checkbox + status
Use case	Provide a static result for every essential action, respecting system settings and an explicit local opt-out.	Explain settling after a drag or a spatial change when a physical response helps orientation.
Mobile behavior	Native touch controls; system motion reduction always wins.	Native touch controls; system motion reduction always wins.

Reduced motion and fallback vs Spring animation

Decisive difference

Reduced motion and fallback addresses the same result without movement; Spring animation addresses a damped physical response. They can be combined when both needs apply.

Reduced motion and fallbackChoose Reduced motion and fallback if you need the same result without movement.
Spring animationChoose Spring animation if you need a damped physical response.

See the nine dimensions See the sources

Nine dimensions

Dimension	Reduced motion and fallbackReduced motion and fallback	Spring animationSpring animation
Trigger	Explicit activation to demonstrate the same result without movement.	Explicit activation to demonstrate a damped physical response.
Modality	Non-modal; surrounding content stays usable.	Non-modal; surrounding content stays usable.
Placement	Inside a bounded specimen; no page-level decoration.	Inside a bounded specimen; no page-level decoration.
Interactivity	Adjust one parameter for the same result without movement; pause or use a static result.	Adjust one parameter for a damped physical response; pause or use a static result.
Focus	Focus stays on the activated control. Reset restores focus to its button.	Focus stays on the activated control. Reset restores focus to its button.
Dismissal	Pause freezes playback; static fallback cancels it. Leaving the specimen cancels its animation and removes listeners.	Pause freezes playback; static fallback cancels it. Leaving the specimen cancels its animation and removes listeners.
Accessible role	button + checkbox + status	button + select + checkbox + status
Use case	Provide a static result for every essential action, respecting system settings and an explicit local opt-out.	Explain settling after a drag or a spatial change when a physical response helps orientation.
Mobile behavior	Native touch controls; system motion reduction always wins.	Native touch controls; system motion reduction always wins.