Dunno why it doesn't work, but it takes me to the front page rather than the info about you. As for why I hate the mouse pointer change, I am not visually minded, as such it took me about 2 minutes to realise the reason I couldn't find my mouse pointer was that it had changed.
Last time I checked, it relied on a proprietary locked service, but perhaps they've fixed that since. If so then yes asciinema is pretty. Otherwise there are more Free/Libre solutions out there, just not as slick.
XML is not a configuration language, it's an information interchange language. If a human ever has to deal with the configuration for that tool then XML is the wrong language for that.
I should add, it's fine to look up how to deal with these things if you want to. If I can't see my way to a solution relatively quickly I look up what it's based on. Don't flog yourself to death :-)