/usr/share/php/HTMLPurifier/AttrDef/ is in php-htmlpurifier 4.7.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/HTMLPurifier/AttrDef/CSS/
/usr/share/php/HTMLPurifier/AttrDef/CSS.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/AlphaValue.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Background.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/BackgroundPosition.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Border.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Color.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Composite.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/DenyElementDecorator.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Filter.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Font.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/FontFamily.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Ident.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/ImportantDecorator.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Length.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/ListStyle.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Multiple.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Number.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/Percentage.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/TextDecoration.php
/usr/share/php/HTMLPurifier/AttrDef/CSS/URI.php
/usr/share/php/HTMLPurifier/AttrDef/Clone.php
/usr/share/php/HTMLPurifier/AttrDef/Enum.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/
/usr/share/php/HTMLPurifier/AttrDef/HTML/Bool.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/Class.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/Color.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/FrameTarget.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/ID.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/Length.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/LinkTypes.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/MultiLength.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/Nmtokens.php
/usr/share/php/HTMLPurifier/AttrDef/HTML/Pixels.php
/usr/share/php/HTMLPurifier/AttrDef/Integer.php
/usr/share/php/HTMLPurifier/AttrDef/Lang.php
/usr/share/php/HTMLPurifier/AttrDef/Switch.php
/usr/share/php/HTMLPurifier/AttrDef/Text.php
/usr/share/php/HTMLPurifier/AttrDef/URI/
/usr/share/php/HTMLPurifier/AttrDef/URI.php
/usr/share/php/HTMLPurifier/AttrDef/URI/Email/
/usr/share/php/HTMLPurifier/AttrDef/URI/Email.php
/usr/share/php/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php
/usr/share/php/HTMLPurifier/AttrDef/URI/Host.php
/usr/share/php/HTMLPurifier/AttrDef/URI/IPv4.php
/usr/share/php/HTMLPurifier/AttrDef/URI/IPv6.php