wp-admin/includes/ms.php:848Prints thickbox image paths for Network Admin.
function _thickbox_path_admin_subfolder() { ?><script type="text/javascript">var tb_pathToImage = "<?php echo esc_js( includes_url( 'js/thickbox/loadingAnimation.gif', 'relative' ) ); ?>";</script> <?php}Introduced in 3.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/ms.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.