Adds an event handler that runs when the key is released within an input.
A dashboard number input element receives a keyRelease event when a user
releases a key on the keyboard while the cursor is inside the input element.
A keyRelease event is fired for printable and non-printable characters.
Notes:
Some browsers do not issue a key release event for certain keys, such as arrow keys or the shift key.
When you retrieve the value from the target property of a KeyboardEvent,
you get the value of the target element before the key was released.
handler(event: KeyboardEvent): void The name of the function or
the function expression to run when the element is clicked.