onKeyDown property
Callback for when the user is pressing a key
Implementation
@override
KeyboardEventCallback? get onKeyDown =>
    (props[_$key__onKeyDown___$UbiquitousDomPropsMixin] ?? null)
        as KeyboardEventCallback?;Callback for when the user is pressing a key
Implementation
@override
set onKeyDown(KeyboardEventCallback? value) =>
    props[_$key__onKeyDown___$UbiquitousDomPropsMixin] = value;