JavaFX - how much client modification for desktop to web application

I am curious as to how much modification to the client must be made to modify a
JavaFX desktop application to run on the web.

Currently we have swing app that runs on very remote desktops ( middle of the ocean) , but we also have a internet version of the app that runs in our offices. JavaFX sounded like a viable alternative for us.

Thanks for your opinion

All you need to do is create a JNLP file, then modify the HTML page to add in some JavaScript to invoke the application. Lastly, deploy.
There are no code changes that are required.

Optionally, if you want the Applet to be able to be dragged off the browser, then you need to
add the AppletStageExtension to your stage.