In August 2011, Google made the following change to the search results (this is no longer default behaviour, though can still be accessed by hitting the Tab
button):
I use my cursor keys to move down the page but now the keys rather irritatingly scroll through each result individually, this causes a complete loss of state when the page transitions between top and bottom of the screen.
Example:
The question is: why might Google done this? Is there any evidence to suggest this behaviour is desired by or useful for users?