**Can You Apply CSS Classes Directly to RMarkdown Code Chunks?**

How to Assign CSS Classes to Specific Code Chunks in RMarkdown

In RMarkdown, you may encounter situations where you need to assign CSS classes to specific code chunks for styling purposes. Is it feasible to accomplish this directly without resorting to hacks like wrapping the chunk in a

element?

Straightforward Solution with Knitr

As of knitr version 1.16, ikiMd supports the addition of HTML classes to source and output chunks using the class.source and class.output options.

To add a CSS class, myClass, to the source chunk labeled 'cars':

summary(cars)

With this, the source chunk will be rendered with the myClass class applied.

Legacy Technique with Fenced Code Attributes

Before the introduction of class.source, there was a workaround using Markdown's fenced_code_attributes extension and a knitr output hook:

• Enable Fenced Code Attributes: Add the following line to your YAML header:

  output: 
    html_document:
      md_extensions: +fenced_code_attributes

• Create Output Hook: Include the following chunk at the beginning of your document:

  knitr::knit_hooks$set(source = function(x, options) {
  return(paste0(
  "`{.r",
  ifelse(is.null(options$class),

  "", 
  paste0(" .", gsub(" ", " .", options$class))

  ),
  "}n",
  x,
  "n`"
  ))
  })

• Assign CSS Class: Use the following syntax to assign a CSS class to a code chunk:

  summary(cars)

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