wp-includes/script-loader.php:3386Loads classic theme styles on classic themes in the frontend.
function wp_enqueue_classic_theme_styles() { if ( ! wp_theme_has_theme_json() ) { wp_enqueue_style( 'classic-theme-styles' ); }}Introduced in 6.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/script-loader.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.