Does WebGL supports coroutines?

Asked this in answers with no success.
I have a project with a bunch of coroutines. There is nothing special in it besides that.
It works fine as a Windows build.
It builds into WebGL with no problem but when I launch it - nothing seems to work. Scene is loaded but nothing past it.

Yeah it should be supported. Post code?

Aye coroutines are fine in WebGL.
Your issue might be when you’re trying to run the client locally, but not from localhost; which prevents the game from running.
To find out more, open the console in your browser (In Chrome for example the console/developer tools are enabled in menu → more tools → developer tools). You should see a useful error somewhere in the console tab.

Wow! Thanks a lot!

Thank you.

I doubt that it is a good idea to post 1000 line code. Who will read it?!

But it goes smth like this:

StartCoroutine(GetUrlData(Url, ToggleUIOnConnection));

Where ToggleUIOnConnection is callback. Inside it after some fiddling another function call (void). And that one starts another url-processing coroutine and so on.