available_highlighters
                        Syntax highlighting languages available
available_math_fonts    List available math fonts
check_math_fonts        Check math font status
define_macro            Define a user-level LaTeX macro
element_latex           A ggplot2 theme element for LaTeX text
element_markdown        A ggplot2 theme element for markdown text
geom_latex              A ggplot2 geom for LaTeX math labels
geom_markdown           A ggplot2 geom for markdown labels
grobMark                Look up a named anchor inside a LaTeX grob
latex_cache_limit       Set the maximum number of entries kept in the
                        LaTeX layout cache
latex_dims              Get dimensions of a LaTeX expression
latex_grob              Create a grid grob from a LaTeX expression
latex_options           Set or query package-wide LaTeX rendering
                        defaults
latex_tree              Inspect the parsed layout of a LaTeX expression
latex_wrap              Wrap standard text for math-first LaTeX
                        renderers
load_math_font          Load a math font from an OTF file
markdown_box_grob       Render a markdown document as a boxed grid grob
markdown_grob           Render markdown as a grid grob
markdown_style          A style for markdown rendering
md_style                Declarations for one markdown tag
register_highlighter    Add a syntax highlighting grammar
