At first I thought these nice little buttons were animated gifs, but it appears that they are actually moving SVG CSS elements! These two I converted to gifs.
This is a good step towards making ello look good at all resolutions.
For a long time bitmap widgets ruled the electronic user interface due to the low amount of processing power it took to display them. Now that we have multi-core phones and much higher resolution displays it makes sense to create vector based widgets. All the modern desktop operating systems are moving in this direction.