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

html_document_base(
  theme = NULL,
  self_contained = TRUE,
  lib_dir = NULL,
  math_method = "default",
  mathjax = "default",
  pandoc_args = NULL,
  template = "default",
  dependency_resolver = NULL,
  copy_resources = FALSE,
  extra_dependencies = NULL,
  css = NULL,
  bootstrap_compatible = FALSE,
  ...
)

Arguments

theme

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).

self_contained

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).

lib_dir

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.

math_method

Math rendering engine to use. This will define the math method to use with Pandoc.

  • It can be a string for the engine, one of "mathjax", "mathml", "webtex", "katex", "gladtex", or "r-katex" or "default" for mathjax.

  • It can be a list of

    • engine: one of "mathjax", "mathml", "webtex", "katex", or "gladtex".

    • url: A specific url to use with mathjax, katex or webtex. Note that for engine = "mathjax", url = "local" will use a local version of MathJax (which is copied into the output directory).

For example,

output:
  html_document:
    math_method:
      engine: katex
      url: https://cdn.jsdelivr.net/npm/katex@0.11.1/dist

See Pandoc's Manual about Math in HTML for the details about Pandoc supported methods.

Using math_method = "r-katex" will opt-in server side rendering using KaTeX thanks to katex R package. This is useful compared to math_method = "katex" to have no JS dependency, only a CSS dependency for styling equation.

mathjax

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.

pandoc_args

Additional command line options to pass to pandoc

template

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).

dependency_resolver

A dependency resolver

copy_resources

Copy resources

extra_dependencies

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

css

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

Bootstrap compatible

...

Ignored

Value

HTML base output format.