This prints config form for everything we support.
array ( 'Attr' => array ( 'AllowedClasses' => NULL, 'AllowedFrameTargets' => array ( ), 'AllowedRel' => array ( ), 'AllowedRev' => array ( ), 'ClassUseCDATA' => NULL, 'DefaultImageAlt' => NULL, 'DefaultInvalidImage' => '', 'DefaultInvalidImageAlt' => 'Invalid image', 'DefaultTextDir' => 'ltr', 'EnableID' => false, 'ForbiddenClasses' => array ( ), 'ID.HTML5' => NULL, 'IDBlacklist' => array ( ), 'IDBlacklistRegexp' => NULL, 'IDPrefix' => '', 'IDPrefixLocal' => '', ), 'AutoFormat' => array ( 'AutoParagraph' => false, 'Custom' => array ( ), 'DisplayLinkURI' => false, 'Linkify' => false, 'PurifierLinkify.DocURL' => '#%s', 'PurifierLinkify' => false, 'RemoveEmpty.Predicate' => array ( 'colgroup' => array ( ), 'th' => array ( ), 'td' => array ( ), 'iframe' => array ( 0 => 'src', ), ), 'RemoveEmpty.RemoveNbsp.Exceptions' => array ( 'td' => true, 'th' => true, ), 'RemoveEmpty.RemoveNbsp' => false, 'RemoveEmpty' => false, 'RemoveSpansWithoutAttributes' => false, ), 'CSS' => array ( 'AllowDuplicates' => false, 'AllowImportant' => false, 'AllowTricky' => false, 'AllowedFonts' => NULL, 'AllowedProperties' => NULL, 'DefinitionRev' => 1, 'ForbiddenProperties' => array ( ), 'MaxImgLength' => '1200px', 'Proprietary' => false, 'Trusted' => false, ), 'Cache' => array ( 'DefinitionImpl' => 'Serializer', 'SerializerPath' => NULL, 'SerializerPermissions' => 493, ), 'Core' => array ( 'AggressivelyFixLt' => true, 'AggressivelyRemoveScript' => true, 'AllowHostnameUnderscore' => false, 'CollectErrors' => false, 'ColorKeywords' => array ( 'maroon' => '#800000', 'red' => '#FF0000', 'orange' => '#FFA500', 'yellow' => '#FFFF00', 'olive' => '#808000', 'purple' => '#800080', 'fuchsia' => '#FF00FF', 'white' => '#FFFFFF', 'lime' => '#00FF00', 'green' => '#008000', 'navy' => '#000080', 'blue' => '#0000FF', 'aqua' => '#00FFFF', 'teal' => '#008080', 'black' => '#000000', 'silver' => '#C0C0C0', 'gray' => '#808080', ), 'ConvertDocumentToFragment' => true, 'DirectLexLineNumberSyncInterval' => 0, 'DisableExcludes' => false, 'EnableIDNA' => false, 'Encoding' => 'utf-8', 'EscapeInvalidChildren' => false, 'EscapeInvalidTags' => false, 'EscapeNonASCIICharacters' => false, 'HiddenElements' => array ( 'script' => true, 'style' => true, ), 'Language' => 'en', 'LegacyEntityDecoder' => false, 'LexerImpl' => NULL, 'MaintainLineNumbers' => NULL, 'NormalizeNewlines' => true, 'RemoveInvalidImg' => true, 'RemoveProcessingInstructions' => false, 'RemoveScriptContents' => NULL, ), 'Filter' => array ( 'Custom' => array ( ), 'ExtractStyleBlocks.Escaping' => true, 'ExtractStyleBlocks.Scope' => NULL, 'ExtractStyleBlocks.TidyImpl' => NULL, 'ExtractStyleBlocks' => false, 'YouTube' => false, ), 'HTML' => array ( 'Allowed' => NULL, 'AllowedAttributes' => NULL, 'AllowedComments' => array ( ), 'AllowedCommentsRegexp' => NULL, 'AllowedElements' => NULL, 'AllowedModules' => NULL, 'Attr.Name.UseCDATA' => false, 'BlockWrapper' => 'p', 'CoreModules' => array ( 'Structure' => true, 'Text' => true, 'Hypertext' => true, 'List' => true, 'NonXMLCommonAttributes' => true, 'XMLCommonAttributes' => true, 'CommonAttributes' => true, ), 'CustomDoctype' => NULL, 'DefinitionID' => NULL, 'DefinitionRev' => 1, 'Doctype' => NULL, 'FlashAllowFullScreen' => false, 'ForbiddenAttributes' => array ( ), 'ForbiddenElements' => array ( ), 'MaxImgLength' => 1200, 'Nofollow' => false, 'Parent' => 'div', 'Proprietary' => false, 'SafeEmbed' => false, 'SafeIframe' => false, 'SafeObject' => false, 'SafeScripting' => array ( ), 'Strict' => false, 'TargetBlank' => false, 'TargetNoopener' => true, 'TargetNoreferrer' => true, 'TidyAdd' => array ( ), 'TidyLevel' => 'medium', 'TidyRemove' => array ( ), 'Trusted' => false, 'XHTML' => true, ), 'Output' => array ( 'CommentScriptContents' => true, 'FixInnerHTML' => true, 'FlashCompat' => false, 'Newline' => NULL, 'SortAttr' => false, 'TidyFormat' => false, ), 'Test' => array ( 'ForceNoIconv' => false, ), 'URI' => array ( 'AllowedSchemes' => array ( 'http' => true, 'https' => true, 'mailto' => true, 'ftp' => true, 'nntp' => true, 'news' => true, 'tel' => true, ), 'Base' => NULL, 'DefaultScheme' => 'http', 'DefinitionID' => NULL, 'DefinitionRev' => 1, 'Disable' => false, 'DisableExternal' => false, 'DisableExternalResources' => false, 'DisableResources' => false, 'Host' => NULL, 'HostBlacklist' => array ( ), 'MakeAbsolute' => false, 'Munge' => NULL, 'MungeResources' => false, 'MungeSecretKey' => NULL, 'OverrideAllowedSchemes' => true, 'SafeIframeRegexp' => NULL, ), )