[JadeNB]

As siblings have commented, it's not clear what reaction is obscured by your lack of words; but, if it's a veiled comment on the inadvisability of doing this, the author beat you to it:

> Warning: All of this doesn’t really follow any best practices for working with html, css or javascript - on the contrary: what we will be doing may look horrible to some people, and rightfully so - so you may not want to try those things at work just yet.