wp-includes/functions.wp-styles.php:20Initializes $wp_styles if it has not been set.
WP_Stylesfunction wp_styles() { global $wp_styles; if ( ! ( $wp_styles instanceof WP_Styles ) ) { $wp_styles = new WP_Styles(); } return $wp_styles;}Introduced in 4.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.wp-styles.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.