4.2.2 Adjusting font-size in ioslides using R Markdown

[jananiravi]

Thanks for the detailed super-helpful book, @yihui Quick question. I read the sections on adjusting font-size in slides (R Markdown, ioslides presentation). Seems like I can use {.smaller} to change it for the whole slide. I also read that footers can be added (if included in the file definition 4.2.3).

Qn: Is there a way to adjust the font size of individual lines in a particular slide? I tried appending the line with {.smaller} and {.bigger} but that doesn't work within the slide. Thanks!

[dr-harper]

If you want to change the size of individual lines of text, you will have to delve into some custom HTML. Here are some examples based on this Stackoverflow question:

---
title: "Untitled"
output: ioslides_presentation
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE)

Font Sizes

• Standard font
• Change the font colour
• This is some text size 1!
• This is some text size 1!
• This is some text size 2!
• This is some text size 3!
• This is some text size 4!
• This is some text size 5!

  
  ![](https://i.imgur.com/mJM5zis.png)

Hope that helps!

---

As a tip, Stackoverflow is a good place if you are looking for general guidance. GitHub issues are less monitored, and are better used if there is a suspected bug or issue with the package or software. You may also consider https://community.rstudio.com for questions.

[jananiravi]

Thanks, @mikey-harper True, I hadn't tried HTML tags yet. I was looking for Markdown-based shortcuts and skipped checking out the most obvious option!

[dr-harper]

Markdown by design only allows a limited amount of formatting. But its power comes from this simplicity :)

The cheatsheet sets out pretty much all the built-in formatting: http://www.rstudio.com/wp-content/uploads/2016/03/rmarkdown-cheatsheet-2.0.pdf .