Captivate 2019 HTML5 output - any changes?

I'm still waiting on my IT guys to get Captivate 2019 to me .

Has anyone noticed if there are any changes in the underlying player code in the HTML 5 output? Are the variables and methods still the same? We do a lot of JS hacks to Captivate to make it behave the way we want it to and I'm wondering how smooth of a transition it will be to 2019.

Thanks!