What level is WCAG 2.5.2?

Level A. It sits under guideline 2.5 Input Modalities of the Operable principle.

What are common ways pages fail WCAG 2.5.2?

Buttons fire on `mousedown` rather than `click`, leaving no chance to abort.

How do I fix WCAG 2.5.2 issues?

Use the `click` event (or up-event) to commit actions. Allow drag-cancellation by releasing outside the trigger.

2.5 Input Modalities · Operable

WCAG 2.5.2 Pointer Cancellation

Level A

For functions operated by single-pointer activation: the down-event alone must not trigger; either trigger on up-event, or allow abort by moving away before release.

Common failures

Buttons fire on `mousedown` rather than `click`, leaving no chance to abort.

How to fix

Use the `click` event (or up-event) to commit actions.
Allow drag-cancellation by releasing outside the trigger.

Related criteria

WCAG 2.5.1 Pointer Gestures Level A