3 flashes or below threshold - accessibility for web writers
Don't use images that flash more than three times per second unless the colours are dim enough to reduce the likelihood of causing a seizure.
Benefits of avoid flashing content
People with photosensitivity can have a seizure triggered by content that flashes at certain rates. Some are even more sensitive to flashing when it's very bright or red.
Check flashing content before you use it
If you're planning to use an image that contains flickering or flashing content, you should check that the flash rate and colour threshold are low enough to be safe.
- Three flashes or below threshold - understanding success criterion 2.3.1
- Three flashes - understanding success criterion 2.3.2
- Web Content Accessibility Guidelines 2.0