I suppose you could develop a web-based game in C++. I think it would probably be looked on as an exercise in masochism. If "reinventing the wheel" is the term for developing an idea which is already widely available, your idea sounds a little like "It's a wheel - only it's made of sand!"

Have you looked at any of the existing frameworks? Tried to develop games in them? What is missing from the existing technology that you want to supply? What is wrong that you want to remedy?

It's going to depend entirely on what you want to develop, how you want to deploy it, what you like to use, etc., etc.

If you spell out what it is you want to do, you're likely to get only a mild thrashing for asking "what language should I use" instead of the topic being summarily closed, which seems likely.