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So far we haven't directly created any new HTML::Element objects. All the elements that have appeared thus far were created by HTML::TreeBuilder as part of its delegated task of building whole trees. But suppose that we actually do need to add something to a tree that never existed elsewhere in that or any other tree. In the above section, we actually snuck in creating a new node in this statement:
$template_title->push_content( 'No title' );