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Accessibility Guide

Practices and tools for making products and services accessible to everyone.


Flashing is generally a bad idea. It can cause all sorts of issues, from seizures to motion sickness. If you absolutely must have a flashing element, there are a few things to consider.


Failure at any step below constitutes a 508 compliance issue.

  1. Look for elements that contain flashing.
    • Scrolling or blinking text
    • Scrolling or blinking page elements
    • Videos that contain flickering or flashing
    • GIFs that contain flickering or flashing
  2. Check if you can determine the frequency of “flashing.”
  3. Check that the rate of flashing is less than 3 Hz (3 times a second), or scroll delay is set to >= 400.



This blinking text fails because the rate of flashing can’t be determined and it’s greater than 3 Hz.

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