2.5.2 Pointer Cancellation (A)

Definition for WCAG 2.1 success criterion 2.5.2

2.5.2 Pointer Cancellation: For functionality that can be operated using a single pointer, at least one of the following is true:

No Down-Event
The down-event of the pointer is not used to execute any part of the function;
Abort or Undo
Completion of the function is on the up-event, and a mechanism is available to abort the function before completion or undo the function after completion;
Up Reversal
The up-event reverses any outcome of the preceding down-event;
Essential
Completing the function on the down-event is essential.

Testing success criterion 2.5.2