JSFiddle - React, Tailwind, and code Playground

HTML

<svg id="mySvg" xmlns="http://www.w3.org/2000/svg" version="1.1">
    <text x="20" y="40">Testing</text>
</svg>

JavaScript

var el = document.getElementsByTagName('text')[0];
console.log(el.getComputedTextLength());