| handler | The element which potentially captured the pointer. |
| pointerId | The captured pointer. |
Tests whether an element captured a pointer and, if so, tells the element to release the pointer.
If a pointer release is requested during the propagation of an existing event, the release takes effect only after the ongoing event has been fully dispatched and propagated.
| panel | The panel that holds the element that captured the pointer. |
| pointerId | The captured pointer. |
Releases the pointer.
If a pointer release is requested during the propagation of an existing event, the release takes effect only after the ongoing event has been fully dispatched and propagated.