WP_Site_Health::admin_body_class( string $body_class )

Source

File: wp-admin/includes/class-wp-site-health.php

public function admin_body_class( $body_class ) {
		$screen = get_current_screen();
		if ( 'site-health' !== $screen->id ) {
			return $body_class;
		}

		$body_class .= ' site-health';

		return $body_class;
	}