wp-admin/includes/class-bulk-upgrader-skin.php:107Displays the header before the update process.
public function header() { // Nothing. This will be displayed within an iframe. }Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-bulk-upgrader-skin.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.