Hello, I read your article carefully and installed everything as you described. I'm trying to incorporate the WebEnginWidget into my QT project. When I use the MSVC kit, I can successfully specify the line QT+=widgets webenginewidgets in the .pro file. But then the compiler cannot find #include <QApplication>. When I use the MinGW kit, QT+=widgets webenginewidgets no longer works.
I work on a Windows 11 system. 
Is this the Problem?
Thank you in advance...