JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">
    <h1>Hello world</h1>
    <i>Hi everybody</i>
</div>
<button onClick="download()">Download</button>

JavaScript

function download(){
    var a = document.body.appendChild(
        document.createElement("a")
    );
    a.download = "export.html";
    a.href = "data:text/html," + document.getElementById("content").innerHTML;
    a.click();
}