Show HTML in Python application and handle click

[snippsat]

I want to show a HTML file in a Python application, not in a browser (not in the usual manner) and process a click event locally in Python

Look at pywebview, Flexx,and can search electron python.
GUI toolkit Like PyQt(Webkit) and WxPython(WebView)has build support for render HTM/CSS.

The reason I need to do that is that copying to the clipboard is highly restricted in browsers.

Yes,but would look into this is really needed maybe and other way,
then i would use more normally web-development approach eg for me this would be using Flask.