An example of embedding a gganimate animation in a pdf

pdf_animation.rmd

---
title: "PDF Animation Test"
output: pdf_document
header-includes:
   - \usepackage{animate}
---

`gganimate` now supports animations inside PDF documents. This feature is only 
viewable with Acrobat Reader, however. Remember to include 
`\usepackage{animate}` in the preamble and set `fig.show='animate'` in the chunk
options. Further, the framerate is governed by `interval`rather than any 
`gganimate` settings:

```{r, fig.show='animate', interval=1/10}
library(gganimate)
ggplot(airquality, aes(Day, Temp, group = Month)) + 
  geom_line() + 
  transition_reveal(Month, Day)
```

Is it possible to get and html_document output with controls? Similar as done in the PDF document.

You might also want to use transition_reveal(Month) in line 18 instead of transition_revel(Month, Day) as indicated thomasp85/gganimate#270