What the standard says
For functionality that can be operated using a single pointer, at least one of the following is true:
Why it matters
People with tremor land on the wrong control regularly. Firing on mousedown removes the ability to slide off and cancel.
What a failure looks like
- failsA delete button bound to `mousedown` or `pointerdown`.
How to fix it
- doFire on `click` / the up event, or provide an undo.
How A11ySignal checks it
manual
No automated rule can judge this criterion, and we will not pretend otherwise. A clean scan does not mean 2.5.2 passes — it means nothing we can measure fails. This one needs a person.