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Almost, but not quite a guide to accessibility requirements
2 Operable

2.3 Seizures and Physical Reactions

Do not design content in a way that is known to cause seizures or physical reactions.

2.3.1 Three Flashes or Below Threshold

Conformance level: A

Do not include content that flashes more than three times in one second.

2.3.2 Three Flashes

Conformance level: AAA

Avoid content that flashes more than three times in one second.

2.3.3 Animation from Interactions

Conformance level: AAA

Provide a mechanism to disable non-essential animations triggered by interactions.