When I first saw this I said it was a nice old game effect but what actually does is to show your DOM in a pretty effect.

The generated spectrum will contain every single nodeType 1 present in the document and will show via tooltip info about that node (nodeName, id if present, className if present). Moreover, it highlights somehow that node temporary changing the background (yellow one). The most wicked effect was in jQuery website itself, since it is dark, and since it is linear enough (you scroll and the spectrum is almost there where you scroll).

Click to see the effect Spectrum DOM Analyzer — pretty cool right? Try to hover your mouse over the nodes.

The official link is here: webreflection.blogspot.com/…