Some forwarding from hig.kde.org seems broken
https://hig.kde.org/style/writing/capitalization.html is not forwarded. Removing the .html makes it work though.
Found in KNotifications docs, so possibly once worked.
Update: https://hig.kde.org/style/typography.html also fails, as seen in kwidgetsaddons
Edited by Friedrich W. H. Kossebau