Principle 2 Operable · Guideline 2.3: Seizures and Physical Reactions
2.3.2 Three Flashes
No flashing above three per second at all – without the exceptions in 2.3.1.
What this means in practice
2.3.1 permits small areas and low contrast; at AAA the limit applies without exception.
Normative wording
The binding text lives at the W3C. What you read here is our own faithful rendering – not a quotation.