Pointer Cancellation (2.5.2)

For single-pointer actions, at least one of the following must be true: the down-event does not trigger the action, the action is triggered on the up-event and can be aborted, the up-event reverses any outcome of the down-event, or completing the action on the down-event is essential.

WCAG Reference

Applies to: WCAG 2.1, WCAG 2.2 Introduced in: WCAG 2.1 | Level: A | Read the official specification →

What this rule checks

The scanner verifies that interactive elements do not fire irreversible actions on mousedown or touchstart alone, allowing users to abort by moving the pointer away before releasing.

Why it matters

Users with motor impairments frequently trigger accidental clicks. Firing on the up-event (click/mouseup/touchend) allows them to move the pointer off the target before releasing, cancelling the action.

Common failure patterns

destructive actions (delete, submit, purchase) triggered on mousedown
drag-and-drop that commits on pointerdown with no undo
custom buttons that respond to touchstart instead of click

Remediation guidance

use click events rather than mousedown or touchstart for actions
if down-event activation is needed, provide an undo or confirmation step
implement drag cancellation by allowing users to drop outside the target zone
test by pressing down on a button, dragging away, and releasing to confirm no action occurs