JSFiddle - React, Tailwind, and code Playground

HTML

<svg id="svg" xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink">
    <line x1="10"  y1="10" x2="100"   y2="100" style="stroke:#00FF00;"/>
</svg>

JavaScript

document.getElementById('svg').insertAdjacentHTML('beforeend', '<line x1="100"  y1="10" x2="10"   y2="100" style="stroke:#FF0000;"/>');