This is an example from Kirupa p. 329. Below is the DOM tree for ex7-06.html. Two event listeners (one with phase set to "true" or capture, and the other set to "false" or bubbling) are attached to every node in the body. If a "click" is initiated by one of the three buttons, (the target), the event travels from the top of the tree down to the target button, then back up to the top.
On the way down, notes are written to the console by each node encountered, in descending order. And on the return to the top, notes are written again by each node, in ascending order. Try out each buton in turn, and observe the console.