Would there be a possibility of embedding chromium? Since of course it's actively developed and everyone including their pet cat are using it as a rendering engine these days (including microsoft) Not sure of the compatibility with the BSD license would go...
It's technically possible of course (one most, but not all of our supported platforms), but would be a massive amount of work, probably tying up most of my team for months whilst they figure out how to glue all the pieces together into Qt on Windows, Mac and Linux. I'd far rather they were building actual features.
