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the_html example

        );

        // Add partial for background_color.         $wp_customize->selective_refresh->add_partial(
            'background_color',
            array(
                'selector'            => '#dark-mode-toggler',
                'container_inclusive' => true,
                'render_callback'     => function() {
                    $attrs = ( $this->switch_should_render() ) ? array() : array( 'style' => 'display:none;' );
                    $this->the_html( $attrs );
                },
            )
        );
    }

    /** * Calculates classes for the main <html> element. * * @since Twenty Twenty-One 1.0 * * @param string $classes The classes for <html> element. * @return string */