Solved Show application locally and over WebGL
I understand that by using the -platform webgl argument, I can have my application's user interface streamed to a web browser over WebGL. But this seems to disable the user interface on the local machine. Is it possible to have the user interface shown both locally and over WebGL?
AFAIK, you can currently not use several backends at the same time.
It's a subject you might want to bring to the interest mailing list. You'll find there Qt's developers/maintainers.
According to this video, it should be possible to run the application both locally and remotely: https://vimeo.com/304349023