I love this. I’ve had an idea to do something similar for a while, except each visit would delete a random character from the page source. The character deleted might be part of the content, or it could be part of an HTML tag or CSS, so as the page degraded the layout would break and parts of the source would become visible.
We talk about bit-rot, broken links, etc, so I thought it would be interesting to take that a step further and visualize what would happen if a webpage decomposed over time like organic matter.