kableExtra: Change font size of table footnote

Question

I'd like for my font size in the footnotes to be smaller than the text in the table, but can't figure it out. Is there something similar to kable_styling where I can edit the text and color of rows in the table that can be used for footnotes? I am using RMarkdown to generate the HTML not LateX.

---
title: "Untitled"
output: html_document
---

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

library( kableExtra )
library( knitr ) 

```

```{r mtcars}

 tab_mtcars <- knitr::kable( mtcars[ 1:5 , c( 1:4 )] , format = "html", col.names = c( "MPG", "CYL", "DISP" , "HP" ) ,  align = "lccc" , escape = F ) %>% kable_styling( full_width = T , bootstrap_options = c( "hover", "condensed" , "bordered"), position = "left") %>% add_header_above( c( "mtcars example" = 5 ) , bold = TRUE ) %>% footnote( general = c( "Here is the footnote where I would like font smaller than above" ),     general_title = "Note: ", footnote_as_chunk = T )

```

`r tab_mtcars`

score 7 · Accepted Answer · answered Feb 12 '20 at 12:43

7

You could use the html <small> tag in the text for the general and general_title parameters of the kabaleExtra::footnote function. See example:

tab_mtcars <-
  knitr::kable(
    mtcars[1:5 , c(1:4)] ,
    format = "html",
    col.names = c("MPG", "CYL", "DISP" , "HP") ,
    align = "lccc" ,
    escape = F
  ) %>%
  kable_styling(
    full_width = T ,
    bootstrap_options = c("hover", "condensed" , "bordered"),
    position = "left"
  ) %>% add_header_above(c("mtcars example" = 5) , bold = TRUE) %>% footnote(
    general = c(
      "<small>Here is the footnote where I would like font smaller than above</small>"
    ),
    general_title = "<small>Note: </small>",
    footnote_as_chunk = T ,
    escape = F
  )

answered Feb 12 '20 at 12:43

W. Joel Schneider

1,711
13
14

this is for html. Do you know how to do it in latex, particularly in `kable` latex table. Thanks. – Sharif Jun 11 '20 at 06:16
3

Use the latex \small command, but in R you will need to use quadruple backslashes: "\\\\small{Put small text here}" – W. Joel Schneider Jun 12 '20 at 14:19
In order for this to work you also need escape = FALSE – Ljupcho Naumov Oct 05 '20 at 18:22

score 1 · Answer 2 · answered Feb 11 '20 at 21:53

1

There doesn't seem to be a way to control that from kable() that I can see, so you could change the CSS styling. With your YAML as the following:

---
title: "Untitled"
output:
  html_document:
    css: style.css
---

and a style.css file in the same folder containing some css code:

tfoot {
  font-size: 80%;
}

answered Feb 11 '20 at 21:53

joshpk

729
4
11

This will likely force the entire document into CSS styling, right? So I'd have to create this table in a separate file then import it into the main markdown report file? – kendalorgera Feb 11 '20 at 22:55
I'm not sure what you mean - this would change the footnote size for all tables in the document. Do you only want this change for a particular table? – joshpk Feb 12 '20 at 15:41
For whatever reason it's not allowing me to use style.css. But I was concerned that it would impact the HTML code I used throughout. It's a 1000 line document with state parameters and only a few of the tables need smaller footnotes. – kendalorgera Feb 13 '20 at 17:53

kableExtra: Change font size of table footnote

2 Answers2