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 photosensitivy 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.

You can download a free testing tool that captures a video of the flashing and analyses whether it is safe enough to use. See Photosensitive Epilepsy Analysis Tool.

References

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