Must Not

Content must not visibly or intentionally flicker or flash more than three times in any one-second period.


Visual flicker, flashing and strobe lighting can affect anyone, but some users will be more susceptible than others. Symptoms may include eyestrain, dizziness, fatigue, headaches, migraine, and nausea. Users with medical conditions such as Ménière's or photosensitive epilepsy can be severely affected, experiencing vertigo, hearing loss and seizures.

A well-documented example of the effects of flicker is Pokémon Shock.

If flicker is unavoidable, the user must be warned before they reach the content.

Where editorially appropriate, provide an alternative version of content that does not flicker but is as close to the original as possible.

For further information on flashing images see BBC Editorial Policy.



Use a tool or app, such as Flicker Tester, to determine the rate of flicker. Note: the BBC also has a Screen Flicker Tool for staff on the internal network.