The subtree of this element in the menu link tree (this link's children).
(Children of a link are only loaded if a link is marked as "expanded" by the query.)
Type: \Drupal\Core\Menu\MenuLinkTreeElement[]
public $subtree;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkTreeElement.php/property/MenuLinkTreeElement::subtree/8.1.x