# jetpack/16.2/modules/theme-tools/compat/twentytwentyone.php

Jetpack – WP Security, Backup, Speed, & Growth, version 16.2. 57 lines.

- Page: https://pluginprobe.com/plugins/jetpack/16.2/code/modules/theme-tools/compat/twentytwentyone.php
- Raw: https://pluginprobe.com/plugins/jetpack/16.2/raw/modules/theme-tools/compat/twentytwentyone.php
- Modified: 2025-11-24T17:00:32+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/jetpack/16.2/code/modules/theme-tools/compat/twentytwentyone.php#L10-L20`.

```php
<?php
/**
 * Jetpack Compatibility File
 * See: https://jetpack.com/
 *
 * @package automattic/jetpack
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit( 0 );
}

/**
 * Add Jetpack extra functionality to Twenty Twenty One.
 */
function twentytwentyone_jetpack_setup() {

	/**
	 * Add theme support for Infinite Scroll.
	 */
	add_theme_support(
		'infinite-scroll',
		array(
			'type'      => 'click',
			'container' => 'main',
			'render'    => 'twentytwentyone_infinite_scroll_render',
			'footer'    => 'main',
		)
	);
}
add_action( 'after_setup_theme', 'twentytwentyone_jetpack_setup' );

/**
 * Custom render function for Infinite Scroll.
 */
function twentytwentyone_infinite_scroll_render() {
	while ( have_posts() ) {
		the_post();
		get_template_part( 'template-parts/content/content', get_theme_mod( 'display_excerpt_or_full_post', 'excerpt' ) );
	}
}

/**
 * Add our compat CSS file for custom styles.
 * Set the version equal to filemtime for development builds, and the JETPACK__VERSION for production
 * or skip it entirely for wpcom.
 */
function twentytwentyone_enqueue_jetpack_style() {
	$version = Jetpack::is_development_version()
	? filemtime( JETPACK__PLUGIN_DIR . 'modules/theme-tools/compat/twentytwentyone.css' )
	: JETPACK__VERSION;

	wp_enqueue_style( 'twentytwentyone-jetpack', plugins_url( 'twentytwentyone.css', __FILE__ ), array(), $version );
	wp_style_add_data( 'twentytwentyone-jetpack', 'rtl', 'replace' );
}
add_action( 'wp_enqueue_scripts', 'twentytwentyone_enqueue_jetpack_style' );

```