Originally conceived for What Is Code as a recirculation module to link to other pages. The idea is just to show source and rendered html in some animated manner. It doesn’t work cross-origin so I have some dummy html pages here, so they are fetching dummy source but linking to real source, but if it were same-origin it could just fetch the real url.
Uses Fetch API, thus Fetch polyfill, thus es6-promise polyfill.
Should really use d3.timer instead of setInterval incrementing character by character…