This method is abstract and should be explicitly defined in the child class, as needed. Also note that $output is passed by reference, so any changes made to the variable within the following methods are automatically handled (no return, echo, or print needed).
“End Element”. Generally, this method is used to add any closing HTML tag for a single tree item (such as </li>, </span>, or </a>) to $output. Note that elements are not ended until after all of their children have been added.
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