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;"/>');