Inspired by hellbox
Maybe the tiniest responsive lightbox script of the world.
820 bytes (minified)
Brave people can use the unminified version which is 992 bytes "big".
Tested on Chrome, Firefox, Safari, Android, iOS
<script src="trlbox.js"></script>
Add an image link with the CSS class "trlbox".
<a href="big-image.jpg" class="tlrbox">
<img src="thumbnail-image.jpg">
</a>