Menu type -- The "default" local task, which is initially active.
Every set of local tasks should provide one "default" task, that links to the same path as its parent when clicked.
includes/ menu.inc, line 178
- API for the Drupal menu system.
define('MENU_DEFAULT_LOCAL_TASK', MENU_IS_LOCAL_TASK | MENU_LINKS_TO_PARENT | MENU_VISIBLE_IN_BREADCRUMB)