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WCAGA

How to test criterion 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)

What this criterion says

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.

Note

Since any content that does not meet this success criterion can interfere with a user's ability to use the whole page, all content on the web page (whether it is used to meet other success criteria or not) must meet this success criterion. See Conformance Requirement 5: Non-Interference.

Official methodology to test criterion 2.3.1

Official W3C techniques

The W3C does not publish a test procedure for this criterion. It publishes techniques instead: documented ways to meet it, and the failures that do not.