/usr/include/KF5/KHtml/khtmlsettings.h is in libkf5khtml-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | // Forwarding header for <KHTMLSettings>
#include "khtml_settings.h"
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