How can I customize the background color of specific code chunks in RMarkdown to highlight unfavorable code practices?

Customizing Chunk Background Colors in RMarkdown

Question:

How can you modify the background color of specific code chunks in RMarkdown documents, particularly to highlight unfavorable code practices?

Answer:

To achieve custom chunk background colors in RMarkdown, utilize the class.source option within the code chunk header. This allows you to specify a CSS class and apply custom styling to that particular chunk.

Here's how you can implement it:

1. Create a CSS Class:

Define a CSS class, such as "badCode," to style the chunk you wish to highlight. In your RMarkdown header, add the following CSS code:

---
output: html_document
---

.badCode {
background-color: red;
}

**2. Apply the CSS Class to a Chunk:**

Within the code chunk you wish to highlight, specify the `class.source` option and assign it the name of your custom CSS class. For instance, this command will apply the "badCode" class to the following chunk:

summary(cars)

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