I can open a .html file directly from the file system by passing it as parameter to the konqueror executable. However all links within the html need to be relative for this to function. Why does Konqueror not use the current directory for links with absolute path? That should be easy to do and I could test web pages up to a certain extent offline. No less important would be that I could view web pages downloaded with "wget -p" using konqueror, then. I have a lot of these downloads and this type of download may be preferred to .war-s due to compatibility and resource sharing.
Dear user, KHTML (and KJS) was a long time more or less unmaintained and got removed in KF6. Please migrate to use a QWebEngine based HTML component. We will do no further fixes or improvements to the KF5 branches of these components beside important security fixes. For security issues, please see: https://kde.org/info/security/ Sorry that we did not fix this issue during the life-time of KHTML. Greetings Christoph Cullmann