NaCL Chrome plugin checker
Add to HTML:
<div id="Check-div">
<h3 id="checker">Checking browser compatibility, please wait...</h3>
</div>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/MagnusMarx/NaCL/check.css">
<script src="https://cdn.jsdelivr.net/gh/MagnusMarx/NaCL/check_browser.js"></script>
<script src="https://cdn.jsdelivr.net/gh/MagnusMarx/NaCL/check.js"></script>
NPM
npm install nacl-check