Diagramming (web pages as graphs)

This HTML Graph applet converts any website into a graph.  It generates an animated “growing” representation of the linear or nested relationships between different HTML tags within the website. Here is what liveness.org/plasticfutures looks like.  Each time you reload the page the graph “grows” in a new configuation like plants or microbes in a petri dish (or a city?).

There is an explanation of how it works here including a number of images showing how the structures of different websites differ.