2.3.1 Limited Flashing Content

Nothing on a webpage flashes more than three times in a second.

The terms “flashing” and “blinking” can mean the same thing.  WCAG distinguishes flashing as content that can cause a seizure.  Blinking refers to content that can be a distraction.  The two can be the same if blinking occurs faster than three times per second.

What to do:

  • Limit or eliminate any flashing content

Plain English Explanation:

2.3.1 is written to prevent seizures.

The point here is to severely restrict flashing content.

Although there are exceptions that provide for automatic content, I recommend making your website as static as possible by default, with options to activate helpful automatic content.

Understanding 2.3.1

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