Set values set on browser before calling event listeners.

def on_event_pre(self, e: Event) -> None:
        """Set values set on browser before calling event listeners."""
        super().on_event_pre(e)
        ct_msg = e.init.get('currentTarget', dict())
        if e.type in ('input', 'change'):
            # Update user inputs
            if self.type.lower() == 'checkbox':
                self._set_attribute('checked', ct_msg.get('checked'))
            elif self.type.lower() == 'radio':
                self._set_attribute('checked', ct_msg.get('checked'))
                for other in self._find_grouped_nodes():
                    if other is not self:
                        other._remove_attribute('checked')
            else:
                self._set_attribute('value', ct_msg.get('value'))