## How to Customize CSS Classes for RMarkdown Code Chunks?

Customizing CSS Class for RMarkdown Code Chunks

In RMarkdown, assigning a custom CSS class to a specific code chunk allows for enhanced styling and targeting of output elements. The following provides a straightforward solution to achieve this:

Utilizing class.source Option

With the introduction of version 1.16 in knitr, options like class.source and class.output became available. Using class.source, you can add CSS classes to source code chunks:

summary(cars)

This code will assign the myClass class to the code chunk labeled 'cars' in the HTML output.

Fenced_code_attributes Extension

In earlier versions of knitr, the fenced_code_attributes Pandoc extension could be utilized. This requires enabling the extension in the YAML header and setting an output hook in R code:

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

summary(cars)

In this example, the myClass1 and myClass2 classes are assigned to the 'cars' code chunk.

By applying either method, you can now style and target the specified code chunk using CSS attributes as needed.

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