Flashing content (AAA)

Silktide asks you to confirm that nothing on your pages flashes more than three times per second, with no exceptions of any kind. Rapid flashing can trigger seizures in people with photosensitive epilepsy, so this is checked by a human review of each page.

Why this matters

For people with photosensitive epilepsy, rapidly flashing content can cause a seizure within seconds. The baseline legal requirement allows flashing that stays below defined size and intensity thresholds; this criterion of (success criterion 2.3.2) removes that allowance entirely, because thresholds are easy to misjudge and the consequence of getting them wrong is physical harm. Meeting it is the safest position a website can take.

How to fix it

This check prompts you to review each page:

Watch the page's videos, animations and any scripted effects. Look for anything that flashes - rapid alternation between light and dark or strongly contrasting states.
Confirm nothing flashes more than three times in any one second period. At this level there is no exception for small or low-intensity flashing: any content exceeding three flashes per second fails.
Remove or slow down anything that fails - re-edit videos and reduce animation frequency in code.
Once you are satisfied the page is safe, the finding.

How Silktide tests this

Every page is flagged for manual review. Detecting flashing reliably requires observing the page's motion over time, including video content, which cannot be judged automatically.

Troubleshooting

This check covers WCAG 2.3.2 (level AAA), the strictest standard. Flashing content (A) covers success criterion 2.3.1, the legally required baseline, which permits flashing below defined size and intensity thresholds. If your content has no flashing at all, both pass.