As you wonder over the gap below, five boxes numbered 1 to 5 should appear. Clicking in the whitespace will make the boxes all show up temporarily so that you can see where they are.
This next test should look and act almost identically, but this time the inner boxes are floating. The only visible difference should be that the container div (the tall dark teal one) should be wafer thin, and so the numbered divs should not actually be inside it.
At the moment, the floated DIVs are not getting the events!
The End.