accessibility-guidelines

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Flashes

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Summary

Do not show anything that flashes more than three times a second.

A page must not contain content that flashes more than three times a second.


Requirements

Why?

A well-documented example of the effects of flicker is Pokémon Shock – this article is safe to view.

Official wording in the Web Content Accessibility Guidelines

2.3.1 Three Flashes or Below Threshold: Web pages do not contain anything that flashes more than three times in any one second period, or the flash is below the general flash and red flash thresholds. (Level A)

This applies to native apps by replacing “Web pages” with “Apps”.

See the W3C’s detailed explanation of this guideline with techniques and examples.


More info

Sources

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This document is in beta. Help us by reporting issues via Github or email