“When you’re in this situation and hit space-bar or page down, what you’d like to see is the exact same behaviour, as shown in Figure 4; zero or one lines of overlap between screens.”

The way browsers behave in this scenario has always bugged me. Not only do you stand a good chance of loosing track of your place in the article you’re reading, but you also have to look towards the bottom of your screen which is sub-optimal (if you’ve got your seating position right, anyway).