Shortly after producing this example of animated chart drawing in R with SVG + javascript using walkway.js, I saw on Twitter this vivus.js. The biggest difference is vivus.js seems to work better in @RStudio. See code.R to replicate and extend.
Modified http://maxwellito.github.io/vivus/dist/vivus.min.js to a secure url
https://maxwellito.github.io/vivus/dist/vivus.min.js