Also, JSX is pretty much literally this. But yes, HTML was clearly designed for producing output markup; but in reality the people who want to generate markup

Also, JSX is pretty much literally this. But yes, HTML was clearly designed for producing output markup; but in reality the people who want to generate markup want to handle nested data, if/else, and loops, because that is better than copy pasting a bunch of markup everywhere and occasionally fat-fingering something.