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Various tree builders are available, each with their own configuration:

Configuration Setting

Html5TreeBuilderXHtml5TreeBuilderXmlTreeBuilder
anytag
(allow any tag)
NoNoYes
attrminimize
(automatically minimize attribute names)
YesYesNo
ignorecase
(ignore tag case)
YesNoNo
lowercase
(automatically lowercase tag name)
YesYesNo
opttags
(optional tags) 
YesNoNo
tags
(list of tags)
HTML5HTML5None
voidtags
(list of void tags)
HTML5HTML5None