[Furzel]

Didn't knew about the HTML part, which is not such a bad news, when most of the self taught programmers I knew started (real) programming it was either on a calculator or because HTML was no longer enough. Even if I don't consider HTML to be real programming, it's enough to be a first step in the rabbit hole, and we all know how deep this hole can be if you care to keep digging.

As for the outside of class hour part, as far as I know it's not 'outside class hour' literally but more reserved hours for non standard class activities ( back in my time that's were I was first taught English which was not a 'standard' class ). Besides, in primary school you only have one teacher, which means most of them will not be half decent at teaching CS, relying on volunteering teachers and/or parents seems like the good way to present CS to young children.

[antoinec]

It's definitely not a programming language at all. But for young kids it's much more appealing to create a web page with colors and animation than a calculator in Python. And that's the goal, not make them able to program, but show them what are the possibilities.

And, on the teacher's side, it's going to be easier to teach most of them HTML rather than a real programming language.