Focus input field inside keydown event handler

If you focus an input field inside a keydown event handler, the value will actually end up inside the focused input field. It makes sense, I just never thought about it.

Example

window.addEventListener('keypress', (event) => {
    document.querySelector('input').focus();
});

You can try it here: https://jsfiddle.net/vq38uhne/1/

Press any key while the input field is not focused.
The value will still end up inside the input field because it's being focussed in the keydown event handler.