wp-includes/class-wp-duotone.php:1233Appends the used global style duotone filter presets (CSS custom properties) to the inline global styles CSS.
public static function output_global_styles() { if ( ! empty( self::$used_global_styles_presets ) ) { wp_add_inline_style( 'global-styles', self::get_global_styles_presets( self::$used_global_styles_presets ) ); } }Introduced in 6.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-duotone.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.