Fathom.js β Present JavaScript in its native environment.If youβre making a presentation on JavaScript, make it in Javascript.Write your slideshow in HTML, style it with CSS and control it with some jQuery-powered JavaScript. When youβre done, Fathom.js even lets you sync the video of your presentation quickly and easily.Fathom.js comes with mouse, keyboard and scroll bar navigation built in and provides a simple API for creating your own custom interfaces.