Don’t use any flashing images Accessibility Checkpoint


Web pages must not contain any images that flash more than three times in any one second period.


Any content that flashes more than 3 times a second can trigger seizures in people with photosensitive seizure disorders.

Applicable standards

  • WCAG 2.0 (Success Criteria: 2.3.2 level AAA)
  • WCAG 2.1 (Success Criteria: 2.3.2 level AAA)
  • WCAG 2.2 (Success Criteria: 2.3.2 level AAA)

Change history

  • 5.37 May 2020 Improved detection.
  • 5.9 Jun 2015 Handle non-standard image tag.
  • 5.6 Sep 2014 Now triggers WCAG 1 and Section 508 issue as well as WCAG 2.
  • 5.5 May 2014 Fixed false positive on non-looping animated GIFs.
  • 5.4 Feb 2014 Added.

This page describes a web site issue detected in HTML documents by SortSite Desktop and OnDemand Suite.

Rule ID: AccWcag2-2.3.2-1