Adding custom CSS tags to an RMarkdown html document

Question

I have an RMarkdown document outputting to HTML of the same form as the below example. What do I add where to apply unique CSS ids or classes to each plot output?

Answer 1

You can tell knitr (which is used under the hood) with results="asis" to embed a chunk's output directly into the html. Within the chunk you can use cat to simply write a style tag including your css definitions:

```{r results="asis"}
cat("

")
```

See http://yihui.name/knitr/options/#chunk_options for details.