/usr/share/php/HTMLPurifier/HTMLModule/ is in php-htmlpurifier 4.7.0-1build1.
This file is owned by root:root, with mode 0o775.
..
/usr/share/php/HTMLPurifier/HTMLModule/Bdo.php
/usr/share/php/HTMLPurifier/HTMLModule/CommonAttributes.php
/usr/share/php/HTMLPurifier/HTMLModule/Edit.php
/usr/share/php/HTMLPurifier/HTMLModule/Forms.php
/usr/share/php/HTMLPurifier/HTMLModule/Hypertext.php
/usr/share/php/HTMLPurifier/HTMLModule/Iframe.php
/usr/share/php/HTMLPurifier/HTMLModule/Image.php
/usr/share/php/HTMLPurifier/HTMLModule/Legacy.php
/usr/share/php/HTMLPurifier/HTMLModule/List.php
/usr/share/php/HTMLPurifier/HTMLModule/Name.php
/usr/share/php/HTMLPurifier/HTMLModule/Nofollow.php
/usr/share/php/HTMLPurifier/HTMLModule/NonXMLCommonAttributes.php
/usr/share/php/HTMLPurifier/HTMLModule/Object.php
/usr/share/php/HTMLPurifier/HTMLModule/Presentation.php
/usr/share/php/HTMLPurifier/HTMLModule/Proprietary.php
/usr/share/php/HTMLPurifier/HTMLModule/Ruby.php
/usr/share/php/HTMLPurifier/HTMLModule/SafeEmbed.php
/usr/share/php/HTMLPurifier/HTMLModule/SafeObject.php
/usr/share/php/HTMLPurifier/HTMLModule/SafeScripting.php
/usr/share/php/HTMLPurifier/HTMLModule/Scripting.php
/usr/share/php/HTMLPurifier/HTMLModule/StyleAttribute.php
/usr/share/php/HTMLPurifier/HTMLModule/Tables.php
/usr/share/php/HTMLPurifier/HTMLModule/Target.php
/usr/share/php/HTMLPurifier/HTMLModule/TargetBlank.php
/usr/share/php/HTMLPurifier/HTMLModule/Text.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/
/usr/share/php/HTMLPurifier/HTMLModule/Tidy.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/Name.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/Proprietary.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/Strict.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/Transitional.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/XHTML.php
/usr/share/php/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php
/usr/share/php/HTMLPurifier/HTMLModule/XMLCommonAttributes.php