You have hash links to update the browser history when you change backgrounds which is a nice addition. The background pattern does not update though which is expected.

I think @Taylor Cooney's comment above about updating the browser tab title is a small and nice addition (the bonus is it is easy to implement).

Here's a quick sample. You can paste this in the dev console of a browser to see it in action: var i = 60; function tick() { window.document.title = 'Time: ' + i--; } setInterval(tick, 1000);

This definitely has a use, but I'd stress to have real copy as early as possible. Check Getting Real by 37Signals, here's a note snippet from it:

Use real text vs. Lorem ipsum ideally (text is not a shape, it is valuable information to read). Real copy helps determine how long certain fields should be, how expand/contracts should look, and what your app truly looks like.

I am curious, if a book titled "Coding for Designers" existed, what would you want it to contain? Not a test, so responding to one or more questions is totally fine: https://goo.gl/forms/hFoc5wE7x7KCYDwI2