Does Turbotax "Online" have all the same features as "Desktop" if you pay for online ahead of time?

I've heard differing things, like there are some features on Desktop that are only on desktop no matter what.

though others seem to imply that if you pay for online ahead of time (say, when you start inputting data), then all the features are the same (like making an 'investment income' election for qualified dividends)...

anybody have certainty on this?  I'm also trying to dig in to some numbers i see online that i can't "drill down" into (without paying yet apparently)