Vignettes are long form documentation commonly included in packages. Because they are part of the distribution of the package, they need to be as compact as possible. The `html_vignette` output type provides a custom style sheet (and tweaks some options) to ensure that the resulting html is as small as possible. The `html_vignette` format:
- Never uses retina figures
- Has a smaller default figure size
- Uses a custom CSS stylesheet instead of the default Twitter Bootstrap style
## Vignette Info
Note the various macros within the `vignette` setion of the metadata block above. These are required in order to instruct R how to build the vignette. Note that you should change the `title` field and the `\VignetteIndexEntry` to match the title of your vignette.
## Styles
The `html_vignette` template includes a basic CSS theme. To override this theme you can specify your own CSS in the document metadata as follows:
output:
rmarkdown::html_vignette:
css: mystyles.css
## Figures
The figure sizes have been customised so that you can easily put two images side-by-side.
```{r, fig.show='hold'}
plot(1:10)
plot(10:1)
```
You can enable figure captions by `fig_caption: yes` in YAML:
output:
rmarkdown::html_vignette:
fig_caption: yes
Then you can use the chunk option `fig.cap = "Your figure caption."` in **knitr**.
## More Examples
You can write math expressions, e.g. $Y = X\beta + \epsilon$, footnotes^[A footnote here.], and tables, e.g. using `knitr::kable()`.
```{r, echo=FALSE, results='asis'}
knitr::kable(head(mtcars, 10))
```
Also a quote using `>`:
> "He who gives up [code] safety for [code] speed deserves neither."
