protected function html5ToXhtml( $html ) {
		$config = [
			'valid_xhtml' => 1,
			'unique_ids' => 0,
		];
		$html = \Pressbooks\HtmLawed::filter( $html, $config );
		return $html;
	}
protected function html5ToXhtml( $html ) {
		$config = [
			'valid_xhtml' => 1,
			'unique_ids' => 0,
		];
		$html = \Pressbooks\HtmLawed::filter( $html, $config );
		return $html;
	}
protected function html5ToXhtml ( $ html ) { $ config = [ 'valid_xhtml' => 1 , 'unique_ids' => 0 , ] ; $ html = \ Pressbooks \ HtmLawed :: filter ( $ html , $ config ) ; return $ html ; }
Clean up content processed by HTML5 Parser, change it back into XHTML

@param $html

@return string
Clean up content processed by HTML5 Parser change it back into XHTML