We might draw a line about Turing completeness or intended purpose. Both completely miss the point.
It is fun to try to find Turing tarpits in HTML and/or CSS! But that’s not what makes programming programming.
The previous post is it. The problems of programming — the things that make it difficult, the things that make it rewarding — all come from that collision of human intent with unambiguous machine interpretation. That’s the game right there.
/end