Individual skill
flashing-content
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.
skills/flashing-content/SKILL.md
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- Observed behavior
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Oct 31, 2026
- License
- MIT
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- frontend Repository topic
- front-end-development Repository topic
- front-end-developer-tool Repository topic
- guidelines Repository topic
- checklist Repository topic
- reference Repository topic
- web-development Repository topic
- html Repository topic
- css Repository topic
- javascript Repository topic
- design Derived category
- writing Derived category
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SKILL.mdcore · 2,122 bytesreferences/rule.mddoc · 6,122 bytes
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# Prevent seizure-triggering flashing content
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.
## Quick Reference
- Never flash content more than 3 times per second (WCAG Level A)
- Flashing area must be smaller than 25% of viewport
- Red flashing is especially dangerous—avoid entirely
- Test GIFs, videos, and CSS animations for rapid flashing
## Check
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.