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.