The rmdexamples package illustrates various techniques for extending R Markdown. The examples included here are described in more detail in the articles on HTML Widgets and Shiny Widgets.
To try out rmdexamples locally you should first install the development versions of the htmltools, knitr, and shiny packages. You can do this as follows:
devtools::install_github(c("rstudio/htmltools", "yihui/knitr", "rstudio/shiny"))Then to install rmdexamples:
devtools::install_github("rstudio/rmdexamples")