Pause, Stop, Hide
For moving, blinking, scrolling, or auto-updating content that starts automatically, lasts more than five seconds (for movement), and appears alongside other content, a mechanism is available to pause, stop, hide it, or control its update frequency, unless the movement or update is essential.
In plain language
If something on the page moves, blinks, scrolls, or updates itself automatically next to other content, there must be an easy way to pause, stop, or hide it.
Why it matters
Constant motion can distract people with attention or cognitive disabilities, make text unreadable for people with low vision trying to read alongside it, and even cause discomfort for some. Without a way to stop it, they're forced to deal with a moving target the whole time they're on the page.
In practice
Fails this criterion
A stock ticker scrolls continuously across the page with no pause button and no way to hide it.
Meets this criterion
The same ticker has a visible "Pause" button right next to it that stops the scrolling the moment it's clicked.
Test it yourself
Look for anything on the page that moves, blinks, scrolls, or refreshes on its own for more than a few seconds. If there's no way to pause, stop, or hide it, this criterion is failing.