require-reduced-motion-for-expensive-animations

Require a prefers-reduced-motion: reduce override when expensive transition or keyframe properties are used.

What this catches

• layout or paint properties in transition
• transition: all
• expensive properties inside @keyframes

Rule options

Option	Default	Why
ignoreProperties	[]	Allows explicit exceptions where a project has reviewed motion behavior.

{
 "css-performance-budget/require-reduced-motion-for-expensive-animations": [
  true,
  { "ignoreProperties": ["background-color"] }
 ]
}