Creates an HTML base output format suitable for passing as the base_format argument of the output_format function.

  theme = NULL,
  self_contained = TRUE,
  lib_dir = NULL,
  mathjax = "default",
  pandoc_args = NULL,
  template = "default",
  dependency_resolver = NULL,
  copy_resources = FALSE,
  extra_dependencies = NULL,
  css = NULL,
  bootstrap_compatible = FALSE,



One of the following:

  • A bslib::bs_theme() object (or a list of bslib::bs_theme() argument values)

    • Use this option for custom themes using Bootstrap 4 or 3.

    • In this case, any .scss/.sass files provided to the css parameter may utilize the theme's underlying Sass utilities (e.g., variables, mixins, etc).

  • NULL for no theme (i.e., no html_dependency_bootstrap()).

  • A character string specifying a Bootswatch 3 theme name (for backwards-compatibility).


Produce a standalone HTML file with no external dependencies, using data: URIs to incorporate the contents of linked scripts, stylesheets, images, and videos. Note that even for self contained documents MathJax is still loaded externally (this is necessary because of its size).


Directory to copy dependent HTML libraries (e.g. jquery, bootstrap, etc.) into. By default this will be the name of the document with _files appended to it.


Include mathjax. The "default" option uses an https URL from a MathJax CDN. The "local" option uses a local version of MathJax (which is copied into the output directory). You can pass an alternate URL or pass NULL to exclude MathJax entirely.


Additional command line options to pass to pandoc


Pandoc template to use for rendering. Pass "default" to use the rmarkdown package default template; pass NULL to use pandoc's built-in template; pass a path to use a custom template that you've created. Note that if you don't use the "default" template then some features of html_document won't be available (see the Templates section below for more details).


A dependency resolver


Copy resources


Extra dependencies as a list of the html_dependency class objects typically generated by htmltools::htmlDependency().


CSS and/or Sass files to include. Files with an extension of .sass or .scss are compiled to CSS via sass::sass(). Also, if theme is a bslib::bs_theme() object, Sass code may reference the relevant Bootstrap Sass variables, functions, mixins, etc.


Bootstrap compatible




HTML base output format.