How Can I Highlight Specific Code Chunks in RMarkdown with Distinct Colors?

Altering Code Chunk Background Color in RMarkdown

In RMarkdown, highlighting specific code chunks with distinct colors, such as red, can be useful for identifying questionable practices. While the 'background' option works effectively in .Rnw files, it's not directly supported in .Rmd.

To achieve color modification in .Rmd, we can leverage the 'class.source' option in code chunk headers to implement custom CSS. This enables code-by-code customization, unlike global changes that affect the entire document.

As an example, we can establish a "badCode" class and incorporate CSS to modify its background:

---
output: html_document
---

.badCode {
background-color: red;
}

summary(mtcars)

summary(cars)

This setup will style the background of the cars code chunk in red, offering visual cues for problematic code.

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