wp-content/themes/twentythirteen/functions.php:781Extends the default WordPress body classes.
$classesarrayarrayfunction twentythirteen_body_class( $classes ) { if ( ! is_multi_author() ) { $classes[] = 'single-author'; } if ( is_active_sidebar( 'sidebar-2' ) && ! is_attachment() && ! is_404() ) { $classes[] = 'sidebar'; } if ( ! get_option( 'show_avatars' ) ) { $classes[] = 'no-avatars'; } return $classes;}Introduced in Twenty Thirteen 1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-content/themes/twentythirteen/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.