Where possible, use highcharts to get the image so the examples have a consistent appearance. They must have the same filename (not including the extension) as their name in the data.json name ...

Following on from #204: This kind of visualization is useful to have, and since altair is now using a more recent vega-lite it should be possible to produce this now - but i'm not sure how to do it ...

Abstract graphs or networks are a commonly recurring data type in many fields. In order to visualize such graphs effectively, the graph must be laid out on the screen coherently. Many algorithms exist ...