JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.4.8/d3.min.js"></script>
<div><p>I was already here</p></div>

JavaScript

var data = [ 1, 2, 3, 4 ]
var svg = d3.select("body");

var paragraphs = svg.select("div").selectAll("p").data(data.concat(data));
// data added
paragraphs.enter().append("p");

paragraphs.text( function(d) { return d; });