wp-includes/fonts/class-wp-font-library.php:135Utility method to retrieve the main instance of the class.
WP_Font_Library public static function get_instance() { if ( null === self::$instance ) { self::$instance = new self(); } return self::$instance; }Introduced in 6.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/fonts/class-wp-font-library.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.