In the simplest web server, the server returns HTML. Having the backend return JSON is where you're adding complexity. Your front end code won't even work without some base HTML.

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aembleton 3 days ago | parent [-]

Having the html stored both on a static html site that can be cached and in the code base of a backend server is more complex to me than keeping these concerns separate.

	▲	yawaramin 16 hours ago \| parent [-]
		That's why you just have the HTML in the backend server codebase...which can also make sure it's cached properly with HTTP caching techniques like last modification time, ETag, and so on.