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WCAGA

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.

WCAG references
  • 2.3.1 Three Flashes or Below Threshold (A)

Official methodology to test criterion 2.3.1

No official test methodology is available for this criterion.