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Get Started Free →Use when reviewing rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
.claude/skills/thedaviddias-flashing-content/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-01 | ✗→✓ | ▲ Improved | 14% | 0% |
| case-03 | ✗→✓ | ▲ Improved | -16% | 0% |
| case-04 | ✗→✓ | ▲ Improved | -1% | 0% |
| case-05 | ✗→✓ | ▲ Improved | 13% | 0% |
| case-08 | ✗→✓ | ▲ Improved | 37% | 0% |
Flashing content between 3-60 Hz can trigger seizures in people with photosensitive epilepsy—this is a critical safety requirement, not just an accessibility preference.
Verify no content flashes more than 3 times per second, and that any flashing content occupies less than 25% of the viewport. Test animated GIFs, videos, and CSS animations for rapid flashing patterns.
Remove or slow down rapid flashing animations. Use animation tools to measure flash frequency. Replace flashing effects with fade transitions or static alternatives that convey the same information.
Explain how flashing content between 3-60 Hz can trigger seizures in people with photosensitive epilepsy, and why this is a critical accessibility and safety requirement under WCAG 2.3.1.
Review the rendered markup and interactive states that affect Prevent seizure-triggering flashing content. 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/flashing-content
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | fail→pass | 14,607 | 14,253 | -2% | 1 | 1 | 0% | 2,715 | 3,084 | +14% | 0 | 0 | — |
case-06 | pass→pass | 3,123 | 2,165 | -31% | 1 | 1 | 0% | 644 | 801 | +24% | 0 | 0 | — |
case-02 | pass→pass | 6,444 | 5,667 | -12% | 1 | 1 | 0% | 1,530 | 1,437 | -6% | 0 | 0 | — |
case-03 | fail→pass | 14,049 | 9,248 | -34% | 1 | 1 | 0% | 2,385 | 1,995 | -16% | 0 | 0 | — |
case-04 | fail→pass | 6,534 | 4,748 | -27% | 1 | 1 | 0% | 1,126 | 1,118 | -1% | 0 | 0 | — |
case-05 | fail→pass | 12,590 | 10,503 | -17% | 1 | 1 | 0% | 2,166 | 2,437 | +13% | 0 | 0 | — |
case-07 | pass→pass | 15,231 | 10,059 | -34% | 1 | 1 | 0% | 2,591 | 1,935 | -25% | 0 | 0 | — |
case-08 | fail→pass | 7,453 | 7,909 | +6% | 1 | 1 | 0% | 1,326 | 1,815 | +37% | 0 | 0 | — |
case-09 | pass→pass | 9,481 | 8,112 | -14% | 1 | 1 | 0% | 1,625 | 1,711 | +5% | 0 | 0 | — |
case-10 | pass→pass | 17,588 | 12,229 | -30% | 1 | 1 | 0% | 3,078 | 2,458 | -20% | 0 | 0 | — |
case-11 | fail→fail | 18,282 | 9,802 | -46% | 1 | 1 | 0% | 2,976 | 2,411 | -19% | 0 | 0 | — |
case-12 | pass→pass | 4,420 | 2,302 | -48% | 1 | 1 | 0% | 782 | 751 | -4% | 0 | 0 | — |
case-13 | pass→pass | 15,890 | 7,984 | -50% | 1 | 1 | 0% | 2,007 | 1,519 | -24% | 0 | 0 | — |
case-14 | pass→pass | 13,303 | 9,914 | -25% | 1 | 1 | 0% | 2,070 | 1,896 | -8% | 0 | 0 | — |
case-15 | pass→pass | 6,879 | 4,585 | -33% | 1 | 1 | 0% | 1,163 | 947 | -19% | 0 | 0 | — |
case-16 | fail→pass | 11,365 | 9,739 | -14% | 1 | 1 | 0% | 1,847 | 2,027 | +10% | 0 | 0 | — |
case-17 | fail→pass | 14,309 | 12,001 | -16% | 1 | 1 | 0% | 2,380 | 2,279 | -4% | 0 | 0 | — |
case-18 | fail→pass | 9,363 | 3,808 | -59% | 1 | 1 | 0% | 1,641 | 1,057 | -36% | 0 | 0 | — |
case-19 | pass→pass | 11,304 | 9,796 | -13% | 1 | 1 | 0% | 1,841 | 1,903 | +3% | 0 | 0 | — |
case-20 | pass→pass | 4,034 | 4,533 | +12% | 1 | 1 | 0% | 704 | 1,204 | +71% | 0 | 0 | — |
case-21 | pass→pass | 6,216 | 5,308 | -15% | 1 | 1 | 0% | 965 | 967 | +0% | 0 | 0 | — |
case-22 | pass→pass | 6,950 | 4,721 | -32% | 1 | 1 | 0% | 1,092 | 1,033 | -5% | 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 +36 percentage points is the difference between those two pass rates over the 22 comparable cases.
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.