@view_config(renderer='templates/form.pt', name='checkedinput_withmask')
    @demonstrate('Checked Input Widget (With Input Mask)')
    def checkedinput_withmask(self):
        widget = deform.widget.CheckedInputWidget(
            subject='SSN',
            confirm_subject='Confirm SSN',
            mask = '999-99-9999',
            mask_placeholder = '#',
            size=40)
        class Schema(colander.Schema):
            ssn = colander.SchemaNode(
                colander.String(),
                widget=widget,
                title = 'Social Security Number',
                description='Type your Social Security Number and confirm it',
                )
        schema = Schema()
        form = deform.Form(schema, buttons=('submit',))
        return self.render_form(form)