/usr/share/php/HTMLPurifier/ConfigSchema/schema/Output.SortAttr.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 13 14 | Output.SortAttr
TYPE: bool
VERSION: 3.2.0
DEFAULT: false
--DESCRIPTION--
<p>
If true, HTML Purifier will sort attributes by name before writing them back
to the document, converting a tag like: <code><el b="" a="" c="" /></code>
to <code><el a="" b="" c="" /></code>. This is a workaround for
a bug in FCKeditor which causes it to swap attributes order, adding noise
to text diffs. If you're not seeing this bug, chances are, you don't need
this directive.
</p>
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