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The final markup may or may not actually present this tag as self-closing. For instance: an HTMLBuilder does not consider a <p> tag to be an empty-element tag (it's not in HTMLBuilder.empty_element_tags). This means an empty <p> tag will be presented as "<p></p>", not "<p />". The default implementation has no opinion about which tags are empty-element tags, so a tag will be presented as an empty-element tag if and only if it has no contents. "<foo></foo>" will become "<foo />", and "<foo>bar</foo>" will be left alone. NT)�empty_element_tags)r �tag_namer r r �can_be_empty_elementl s z TreeBuilder.can_be_empty_elementc C s t � �d S )N)�NotImplementedError)r �markupr r r �feed� s zTreeBuilder.feedc C s |d d dfS )NFr )r r( Zuser_specified_encodingZdocument_declared_encodingr r r �prepare_markup� s zTreeBuilder.prepare_markupc C s |S )a� Wrap an HTML fragment to make it look like a document. Different parsers do this differently. 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