public static function get_root_url() {

		// Get the upload directory for this site.
		$upload_dir = wp_upload_dir();

		// The URL.
		$url = trailingslashit( $upload_dir['baseurl'] );

		// Take care of domain mapping.
		// When using domain mapping we have to make sure that the URL to the file
		// does not include the original domain but instead the mapped domain.
		if ( defined( 'DOMAIN_MAPPING' ) && DOMAIN_MAPPING ) {
			if ( function_exists( 'domain_mapping_siteurl' ) && function_exists( 'get_original_url' ) ) {
				$mapped_domain   = domain_mapping_siteurl( false );
				$original_domain = get_original_url( 'siteurl' );
				$url             = str_replace( $original_domain, $mapped_domain, $url );
			}
		}
		$url = str_replace( [ 'https://', 'http://' ], '//', $url );
		return apply_filters( 'kirki_googlefonts_root_url', untrailingslashit( esc_url_raw( $url ) ) . '/webfonts' );
	}