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Get Started Free →Use when reviewing rendered HTML, interactive components, or design-system patterns related to Respect reduced motion preferences. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
.claude/skills/thedaviddias-reduced-motion/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-02 | ✗→✓ | ▲ Improved | 0% | 0% |
| case-14 | ✓→✗ | ▼ Worse | -9% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 16% | 0% |
| case-04 | ✓→✓ | ＝ Same ✓ | -24% | 0% |
| case-05 | ✓→✓ | ＝ Same ✓ | 26% | 0% |
Animations can trigger vestibular disorders, migraines, and seizures—respecting motion preferences makes your site usable for millions of affected users.
Verify that animations respect prefers-reduced-motion, no content flashes more than 3 times per second, parallax and scrolljacking effects have alternatives, and motion warnings appear before pages with excessive animation.
Use @media (prefers-reduced-motion: reduce) to disable animations. Ensure no flashing exceeds 3 flashes/second. Avoid motion behind static text. Provide motion warnings for immersive experiences.
Explain how motion affects users with vestibular disorders, photosensitive epilepsy, and cognitive disabilities, and why providing motion controls and warnings is essential for inclusive design.
Review the rendered markup and interactive states that affect Respect reduced motion preferences. Flag exact elements, roles, labels, focus behavior, or keyboard interactions that violate the rule, and note how to verify the fix with browser accessibility tooling or assistive tech.
For full implementation details, code examples, and framework-specific guidance, see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/accessibility/reduced-motion
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | fail→fail | 15,048 | 12,062 | -20% | 1 | 1 | 0% | 2,810 | 2,713 | -3% | 0 | 0 | — |
case-02 | fail→pass | 14,527 | 11,473 | -21% | 1 | 1 | 0% | 2,385 | 2,387 | +0% | 0 | 0 | — |
case-03 | pass→pass | 10,167 | 8,542 | -16% | 1 | 1 | 0% | 1,810 | 2,097 | +16% | 0 | 0 | — |
case-04 | pass→pass | 8,571 | 4,469 | -48% | 1 | 1 | 0% | 1,466 | 1,112 | -24% | 0 | 0 | — |
case-05 | pass→pass | 10,199 | 9,274 | -9% | 1 | 1 | 0% | 1,657 | 2,081 | +26% | 0 | 0 | — |
case-06 | pass→pass | 11,843 | 8,623 | -27% | 1 | 1 | 0% | 2,211 | 1,925 | -13% | 0 | 0 | — |
case-07 | pass→pass | 9,110 | 6,058 | -34% | 1 | 1 | 0% | 1,697 | 1,405 | -17% | 0 | 0 | — |
case-08 | pass→pass | 11,911 | 6,965 | -42% | 1 | 1 | 0% | 2,036 | 1,575 | -23% | 0 | 0 | — |
case-09 | pass→pass | 2,419 | 2,337 | -3% | 1 | 1 | 0% | 407 | 725 | +78% | 0 | 0 | — |
case-10 | pass→pass | 5,266 | 3,334 | -37% | 1 | 1 | 0% | 946 | 836 | -12% | 0 | 0 | — |
case-11 | pass→pass | 13,236 | 10,138 | -23% | 1 | 1 | 0% | 2,249 | 1,997 | -11% | 0 | 0 | — |
case-12 | pass→pass | 5,235 | 4,105 | -22% | 1 | 1 | 0% | 908 | 956 | +5% | 0 | 0 | — |
case-13 | pass→pass | 5,801 | 4,682 | -19% | 1 | 1 | 0% | 1,068 | 1,183 | +11% | 0 | 0 | — |
case-14 | pass→fail | 10,081 | 6,547 | -35% | 1 | 1 | 0% | 1,725 | 1,576 | -9% | 0 | 0 | — |
case-15 | pass→pass | 8,857 | 7,548 | -15% | 1 | 1 | 0% | 1,633 | 1,567 | -4% | 0 | 0 | — |
case-16 | pass→pass | 10,120 | 7,408 | -27% | 1 | 1 | 0% | 1,858 | 1,684 | -9% | 0 | 0 | — |
case-17 | pass→pass | 4,940 | 4,977 | +1% | 1 | 1 | 0% | 863 | 1,116 | +29% | 0 | 0 | — |
case-18 | pass→pass | 10,262 | 10,141 | -1% | 1 | 1 | 0% | 1,774 | 2,043 | +15% | 0 | 0 | — |
case-19 | pass→pass | 12,727 | 11,214 | -12% | 1 | 1 | 0% | 2,111 | 2,435 | +15% | 0 | 0 | — |
case-20 | pass→pass | 3,104 | 3,160 | +2% | 1 | 1 | 0% | 558 | 857 | +54% | 0 | 0 | — |
case-21 | pass→pass | 5,441 | 4,632 | -15% | 1 | 1 | 0% | 997 | 1,061 | +6% | 0 | 0 | — |
case-22 | pass→pass | 2,458 | 2,802 | +14% | 1 | 1 | 0% | 442 | 815 | +84% | 0 | 0 | — |
DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 22 cases were attempted. The headline lift of 0 percentage points is the difference between those two pass rates over the 22 comparable cases. 1 case got worse with the skill loaded, and it is included in that figure.
Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.
Other measured skills in the registry, with their headline benchmark lift.