Well, as I said:

> If your screen-sharing software does not have these features, urge your company to switch to one that does (or just switch to one that does, if your company policies permit).

Should you choose to embark on it, I sincerely wish you the best of luck in your quest to get collaboration software that's not crippled by platform limitations.

Having said that...

> I think it's impossible to do it on the web because there's no screen sharing web API...

Weirdly, this isn't true. Discord claims to be able to share your screen even in the web browser version. From the "How To Stream In A Discord Channel" section of [0]:

> Info: Currently audio can only be captured by the Windows desktop, MacOS desktop, Chrome browser, and mobile clients. Unfortunately, audio sharing is unavailable on Linux.

I notice a conspicuous absence of "this doesn't work in a web browser" caveats for any of the other screen-sharing things that Discord does. The only caveats I notice are for audio capture on Firefox and on Linux in general.

And yes, while the Info box at the top of the article says that it covers how to do this in the Desktop Client, I tested screen sharing a moment ago in the latest version of Firefox on Linux. It works just fine. When I choose to share my screen in Discord, the web browser pops up a dialog asking me if I'd like to share my screen, and -if so- would I select which window (or the entire screen) to share?

> ...and no overlay drawing API either...

I don't know how one would handle the "permit others to draw on top of the shared window" mechanism, but there's little doubt in my mind that something can be cooked up that's clever and not too offputting to use... assuming that there's not something already available to be used that neither of us are aware of.

[0] <https://support.discord.com/hc/en-us/articles/360040816151-G...>