Trail of Bouncing Balls
This is a demo of an especially cute JavaScript trick: A "hanging" column of dots is produced, and they follow the pointer around the screen.

In this example, the .html file is small, and the JavaScript code is in a separate elastic.js file. But note that the initialization is in the .html file. Moving it to the elastic.js file causes it to stop working.

Some versions of Netscape have a peculiar bug which responds to a window resize by putting the text vertically along the left edge.