WCAG 2.5.2
Level A
Operable
2.5.2 Pointer Cancellation
Actions triggered by a single pointer can be aborted or undone (fire on up-event, not down).
What 2.5.2 Pointer Cancellation means
Users can slide off a control to cancel before releasing.
How to test
Confirm actions complete on release and can be cancelled by moving away.
How to meet it
Trigger on the up-event; allow abort by moving off the target before release.
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Official reference: Understanding 2.5.2 Pointer Cancellation (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
2.3.1 Three Flashes or Below Threshold
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
2.5.3 Label in Name
2.5.4 Motion Actuation
2.5.7 Dragging Movements
2.5.8 Target Size (Minimum)