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Get Started Free →Use when reviewing rendered HTML, interactive components, or design-system patterns related to Provide alternatives to parallax effects. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
.claude/skills/thedaviddias-parallax-effects/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-16 | ✗→✓ | ▲ Improved | 13% | 0% |
| case-20 | ✗→✓ | ▲ Improved | -34% | 0% |
| case-22 | ✗→✓ | ▲ Improved | -14% | 0% |
| case-24 | ✗→✓ | ▲ Improved | -16% | 0% |
| case-17 | ✓→✗ | ▼ Worse | -10% | 0% |
Parallax creates a mismatch between what the eyes see and what the inner ear senses—triggering dizziness, nausea, and vertigo for users with vestibular disorders.
Identify parallax effects where background and foreground move at different speeds. Verify these effects are disabled when prefers-reduced-motion is set, and essential content is accessible without the effect.
Wrap parallax effects in @media (prefers-reduced-motion: no-preference) queries. Provide static fallbacks that convey the same content. Consider adding a user toggle to disable motion effects site-wide.
Explain how parallax effects create a depth mismatch that can trigger vestibular disorders, causing dizziness, nausea, and disorientation in affected users.
Review the rendered markup and interactive states that affect Provide alternatives to parallax effects. 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/parallax-effects
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | pass→pass | 16,394 | 11,485 | -30% | 1 | 1 | 0% | 3,040 | 2,644 | -13% | 0 | 0 | — |
case-02 | fail→fail | 16,433 | 11,069 | -33% | 1 | 1 | 0% | 3,073 | 2,315 | -25% | 0 | 0 | — |
case-03 | pass→pass | 15,155 | 11,610 | -23% | 1 | 1 | 0% | 3,446 | 2,664 | -23% | 0 | 0 | — |
case-04 | pass→pass | 17,355 | 11,287 | -35% | 1 | 1 | 0% | 3,443 | 2,437 | -29% | 0 | 0 | — |
case-05 | pass→pass | 14,925 | 10,203 | -32% | 1 | 1 | 0% | 2,900 | 2,234 | -23% | 0 | 0 | — |
case-06 | pass→pass | 13,144 | 7,738 | -41% | 1 | 1 | 0% | 2,190 | 1,596 | -27% | 0 | 0 | — |
case-07 | pass→pass | 13,414 | 9,324 | -30% | 1 | 1 | 0% | 2,454 | 1,931 | -21% | 0 | 0 | — |
case-08 | pass→pass | 12,384 | 7,582 | -39% | 1 | 1 | 0% | 2,047 | 1,767 | -14% | 0 | 0 | — |
case-09 | fail→fail | 14,789 | 13,072 | -12% | 1 | 1 | 0% | 2,590 | 2,529 | -2% | 0 | 0 | — |
case-10 | pass→pass | 13,298 | 11,126 | -16% | 1 | 1 | 0% | 2,610 | 2,416 | -7% | 0 | 0 | — |
case-11 | pass→pass | 9,227 | 6,226 | -33% | 1 | 1 | 0% | 1,889 | 1,537 | -19% | 0 | 0 | — |
case-12 | pass→pass | 10,863 | 8,746 | -19% | 1 | 1 | 0% | 1,872 | 1,786 | -5% | 0 | 0 | — |
case-13 | pass→pass | 13,510 | 12,056 | -11% | 1 | 1 | 0% | 2,346 | 2,482 | +6% | 0 | 0 | — |
case-14 | fail→fail | 17,809 | 13,156 | -26% | 1 | 1 | 0% | 3,522 | 2,987 | -15% | 0 | 0 | — |
case-15 | fail→fail | 16,749 | 12,249 | -27% | 1 | 1 | 0% | 2,613 | 2,225 | -15% | 0 | 0 | — |
case-16 | fail→pass | 14,429 | 12,992 | -10% | 1 | 1 | 0% | 2,505 | 2,840 | +13% | 0 | 0 | — |
case-17 | pass→fail | 13,466 | 10,142 | -25% | 1 | 1 | 0% | 2,607 | 2,355 | -10% | 0 | 0 | — |
case-18 | pass→pass | 18,846 | 14,105 | -25% | 1 | 1 | 0% | 3,173 | 2,749 | -13% | 0 | 0 | — |
case-19 | pass→pass | 4,723 | 3,632 | -23% | 1 | 1 | 0% | 760 | 931 | +23% | 0 | 0 | — |
case-20 | fail→pass | 20,898 | 12,074 | -42% | 1 | 1 | 0% | 3,926 | 2,600 | -34% | 0 | 0 | — |
case-21 | pass→pass | 14,013 | 11,598 | -17% | 1 | 1 | 0% | 2,330 | 2,329 | -0% | 0 | 0 | — |
case-22 | fail→pass | 13,957 | 10,728 | -23% | 1 | 1 | 0% | 2,324 | 1,992 | -14% | 0 | 0 | — |
case-23 | pass→pass | 11,918 | 9,098 | -24% | 1 | 1 | 0% | 2,058 | 1,780 | -14% | 0 | 0 | — |
case-24 | fail→pass | 12,510 | 9,500 | -24% | 1 | 1 | 0% | 2,394 | 2,002 | -16% | 0 | 0 | — |
case-25 | pass→pass | 15,157 | 14,118 | -7% | 1 | 1 | 0% | 2,566 | 2,710 | +6% | 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. 25 cases were attempted. The headline lift of +12 percentage points is the difference between those two pass rates over the 25 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.