/usr/share/php/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefix.txt is in php-htmlpurifier 4.7.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | Attr.IDPrefix
TYPE: string
VERSION: 1.2.0
DEFAULT: ''
--DESCRIPTION--
String to prefix to IDs. If you have no idea what IDs your pages may use,
you may opt to simply add a prefix to all user-submitted ID attributes so
that they are still usable, but will not conflict with core page IDs.
Example: setting the directive to 'user_' will result in a user submitted
'foo' to become 'user_foo' Be sure to set %HTML.EnableAttrID to true
before using this.
--# vim: et sw=4 sts=4
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