WCAG 2.3.1
Level A
Operable
2.3.1 Three Flashes or Below Threshold
Nothing flashes more than three times per second (or stays below the flash thresholds).
What 2.3.1 Three Flashes or Below Threshold means
Content does not risk triggering photosensitive seizures.
How to test
Review animations/video for rapid flashing above three flashes per second.
How to meet it
Remove or slow flashing content; keep flashes below three per second and within safe area/contrast limits.
Need help meeting 2.3.1?
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Official reference: Understanding 2.3.1 Three Flashes or Below Threshold (W3C)
More Operable criteria
2.1.1 Keyboard
2.1.2 No Keyboard Trap
2.1.4 Character Key Shortcuts
2.2.1 Timing Adjustable
2.2.2 Pause, Stop, Hide
2.4.1 Bypass Blocks
2.4.2 Page Titled
2.4.3 Focus Order
2.4.4 Link Purpose (In Context)
2.4.5 Multiple Ways
2.4.6 Headings and Labels
2.4.7 Focus Visible
2.4.11 Focus Not Obscured (Minimum)
2.5.1 Pointer Gestures
2.5.2 Pointer Cancellation
2.5.3 Label in Name
2.5.4 Motion Actuation
2.5.7 Dragging Movements
2.5.8 Target Size (Minimum)