This document discusses interactive data visualization using JavaScript libraries from R. It presents an example using the d3heatmap package to create an interactive heatmap from the mtcars dataset. It then demonstrates building a Venn diagram using the d3vennR package to visualize the distribution of genres in the top 250 movies dataset. Mouse hover interactivity is added to highlight areas using a callback function in Shiny. The document encourages developing your own htmlwidgets packages if a favorite JS library is unavailable or to contribute back to the R community.