No content flashes more than three times per second

To make websites as safe as possible for all users, you must limit the amount of flashing media. Flashing content can harm the health of some users.

What this means

Don’t add anything to your website that flashes more than three times a second.


  • This builds on Guideline 2.3.1 by removing an exception that I recommend you ignore anyway.
  • Remember, flashing is different to blinking (see Guideline 2.2.2).

See also

About Author

I'm Luke, I started Wuhcag in 2012 to help people like you get to grips with web accessibility. Check out my book, 'How to Meet the WCAG 2.0'.