<p>You can use /sandbox/ for writing and testing your own code. Nothing in /sandbox/ will get checked into the repo, except files that end in .example (so don't edit or add those files). To get started run `npm start` and open the focus-visible.html</p>
<p class="vjs-no-js">To view this video please enable JavaScript, and consider upgrading to a web browser that <a href="https://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a></p>
<p>This demo shows how to implement polyfill for the <b>:focus-visible</b> selector. You can read more about the polyfill <a href="https://github.com/WICG/focus-visible"> here</a>.</p>