9.2.19: Three flashes or below threshold

Where ICT is a web page, it shall satisfy WCAG 2.0 Success Criterion 2.3.1 Three Flashes or Below Threshold.

WCAG 2.0 success criterion: 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.

NOTE: This success criterion is applicable to all content on the Web page (whether or not there is an alternate accessible version of the content) since any part of a document that does not meet this success criterion can interfere with a user's ability to use the whole page (including a link to the alternate version).

Testing methods

Type of compliance Inspection
  1. The ICT is a web page.
  1. Check that the web page does not fail WCAG 2.0 Success Criterion 2.3.1 Three Flashes or Below Threshold [4].
Result Pass: Check 1 is true
Fail: Check 1 is false

There is currently no content classified with this term.

Components that implement this clause

PEAT Photosensitivity Epilepsy Analysis Tool

by Trace R&D Center, University of Maryland

A free tool for analyzing web content to determine if it might cause seizures in those who have photosensitive seizure disorders such as epilepsy.