I'd like to second the thanks; Vega-Lite is awesome. I've two pieces of feedback. The first is I started by using Vega-Lite-API thinking it would be easier to

I'd like to second the thanks; Vega-Lite is awesome. I've two pieces of feedback. The first is I started by using Vega-Lite-API thinking it would be easier to understand. As I tried to do what I needed I found most examples in the manual are JSON only, and the JS API docs weren't helpful. It took a while to work out how to make a log-scale axis, or how to customise the tooltip content (I could see in the JSON how to do it easily) and I gave up trying to work out how to provide a custom colour scale via JS - or to change to another pre-defined one. The second is around toggling on/off the data in the chart. I had ~20 series on one scatter plot, and being able to highlight other members of a series, or turn series on/off would make it easier to explore the data. I found a JSON example of doing this; but not one with the JS-API. It was also more complicated than I hoped, wanting to use Vega-Lite as a better Excel to explore this data, and not to write my own chart-app if that makes sense (different purpose).