htmltools 
Tools for creating, manipulating, and writing HTML from R.
Installation
Install the stable release of htmltools on CRAN:
install.packages("htmltools")Install the development version with:
remotes::install_github("rstudio/htmltools")Quick overview
{htmltools} makes it easy to customize the user interface (UI) of any Shiny or R Markdown project by using R code to generate custom HTML (including JavaScript and CSS).
This Shiny article provides a great introduction to {htmltools} (even if you're not interested in Shiny). As you'll learn in that article, the general foundation that {htmltools} provides allows other R packages (e.g., {htmlwidgets}, {crosstalk}, etc.) to provide "HTML components" in R that users can manipulate and combine in ways the component authors didn't foresee.
For example, as described in depth here, {htmltools} makes it fairly easy to arrange numerous {htmlwidgets} (e.g., {plotly} graphs) into a single static HTML webpage:
library(htmltools)
browsable(tagList(
plot_ly(diamonds, x = ~carat, height = 200),
plot_ly(diamonds, x = ~price, height = 200)
))
Also, thanks to tagQuery(), it is fairly easy to query and manipulate the underlying HTML structure of components. See the tagQuery() article to learn more.
Learn more
If you're looking to learn how to build more custom user interfaces by writing custom HTML/JavaScript/CSS, we recommend the following resource:
- Shiny's UI and extensions articles
- Outstanding UI with Shiny by David Granjon
- JavaScript for R by John Coene