Do you mean lit html? I've seen it before, it uses template strings for html templating: const myTemplate = (name) => html`<div>Hello ${name}</div>`; Compare

Do you mean lit html? I've seen it before, it uses template strings for html templating: const myTemplate = (name) => html`<div>Hello ${name}</div>`; Compared to JSX, I don't like it much. I feel that template strings are unergonomic and fiddly to type a lot, although maybe I'd get used to it.