wp-includes/class-wp-customize-manager.php:4637Determines whether the admin and the frontend are on different domains.
bool public function is_cross_domain() { $admin_origin = wp_parse_url( admin_url() ); $home_origin = wp_parse_url( home_url() ); $cross_domain = ( strtolower( $admin_origin['host'] ) !== strtolower( $home_origin['host'] ) ); return $cross_domain; }Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-manager.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.