How Can I Highlight Specific Code Chunks in RMarkdown Using Custom CSS?

Customizing Code Chunk Background in RMarkdown

To highlight a specific code chunk in a distinctive color, such as red, to denote poor coding practices, RMarkdown presents a viable solution.

In .Rmd files, the conventional background chunk option compatible with .Rnw files is ineffective. To address this, a custom CSS stylesheet is necessary, along with a custom hook for granular control over individual chunks.

R Markdown utilizes the class.source option in code chunk headers to enable custom CSS styles. A class, such as "badCode," can be created for specific chunks, and CSS rules can be crafted to alter their background color.

Here's an illustration using our hypothetical class badCode:

---
output: html_document
---

.badCode {
background-color: red;
}

summary(mtcars)

summary(cars)

By utilizing this method, specific code chunks can be highlighted with custom colors to convey important information or indicate code that requires attention.

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