JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test" style="background-color:blue;">abc</div>
<div id="test1" style="background-color:green;">def</div>
<div id="test2" style="background-color:red;">ghi</div>
<div id="test3" style="background-color:orange;">jkl</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>

JavaScript

d3.select("#test")
	.style("width", "50px");

d3.select("#test1")
	.style("width", 50);

d3.select("#test2")
	.style("height", 50);

d3.select("#test3")
	.style("height", "50px");