rmarkdown 2.24

Fixed file_scope being lost when extending output formats that considers the file_scope using output_format(). Merge behavior is to apply overlay file_scope function onto the result of base_format's file_scope function. This implies that file_scope gains second argument which receives the returned values of the base file_scope (thanks, @atusy, #2488).
Added output_format_dependency() which allows extending output format from within chunks (thanks, @atusy, #2462)
Fix an issue with shiny prerendered document where dependencies context were written twice leasing to parsing error (thanks, @gadenbuie, rstudio/learn#597, #2500).

rmarkdown 2.23

find_external_resources() works with formats defining there own theme argument, like cleanrmd::html_document_clean(), not related to bslib supports (thanks, @gadenbuie, #2493, r-lib/pkgdown#2319).
Fixed version number comparison problems as requested by CRAN.

rmarkdown 2.22

Using css with .scss and .sass file, or with a bslib theme, now works as expected with a shiny runtime (thanks, @cpsievert, #2443, #2447).
Add a pandoc_metadata_file_arg() function to match Pandoc's CLI flag --metadata-file.
Mentions that webshot or webshot2 is required to take screenshot of HTML widget. When not installed, an error message mentionning always_allow_html: true solution will be shown, but setting this is not the solution (quarto-dev/quarto-cli#4225).
html_dependency_jqueryui() updated to 1.13.2 from version bundled in shiny (thanks, @daschnerm, #2477).
Fix an issue with YAML header ending with a commented line containing incomplete yaml (thanks, @keithnewman, #2483).
When code folding is enabled in html_document(), the text on the button to show the content has been changed from "Code" to "Show", because the content to show is not necessarily code, e.g., yihui/knitr#2227.

rmarkdown 2.21

Now HTML output formats use the Font Awesome HTML dependency from the fontawesome package instead of shipping an outdated version of Font Awesome in rmarkdown (thanks, @rich-iannone, #2451).
Fixed a bug caused by a change in the is_blank() function in xfun 0.38 (thanks, @andreahgsin, #2469).

rmarkdown 2.20

The defunct tufte_handout() has been removed from rmarkdown. Please use tufte::tufte_handout() instead.
If an input path to rmarkdown::render() is a symbolic link, it is no longer resolved to its real path (thanks, @SamDM @jmw86069, #1508).
Make sure to avoid creating invalid paths when copying resources (thanks, @mnazarov, #2429).
Make sure logo is properly embedded in ioslides_presentation() when self_contained = TRUE (thanks, @mnazarov, #2428).

rmarkdown 2.19

No longer use xfun::isFALSE() internally.

rmarkdown 2.18

rmarkdown::render() argument output_file is now used for all output formats, if there is only one name for multiple output formats (thanks, @MaelAstruc, #2421).
Custom output formats can provide a custom function to convert Markdown input to the desired output format now. To do so, define the output format via output_format(pandoc = pandoc_options(convert_fun = function(...) {})). The default converting function is pandoc_convert() in this package. See the help page ?pandoc_options for more details.

rmarkdown 2.17

rmarkdown::render_site() will now also look for index.rmd in addition to index.Rmd for custom site generator in YAML with site: (thanks, @kamalsacranie, #2409).
Icons in tabset dropdown are now correctly shown, including when self_contained: false (thanks, @cpsievert, #1697).

rmarkdown 2.16

Pandoc 2.19 has deprecated the argument --self-contained. If you have installed Pandoc 2.19+, rmarkdown will use --embed-resources --standalone as recommended by Pandoc for output formats that use the option self_contained = TRUE (#2382).
pandoc_version() returns a version number of the form X.Y.Z.YYYY.MM.DD for the nightly build of Pandoc now, where YYYY.MM.DD is its build date. Previously it would return X.Y.Z.9999 to indicate the nightly version.

rmarkdown 2.15

Fix navbar issue with website when using Boostrap 5 with bslib (thanks, @guasi, #2379, @cpsievert, #2384).
The tufte_handout() function inside rmarkdown is defunct now. Its codebase was moved to the tufte package in 2016, and this function was marked as deprecated in 2021. Please use tufte::tufte_handout() instead of rmarkdown::tufte_handout(). The latter will be removed eventually from this package.
github_document() gains math_method = "default" and defaults to it. No special processing will be done to inline maths in $ and block maths in $$ as now Github supports it and will render using Mathjax (thanks, @kylebutts, #2361).

rmarkdown 2.14

Improved highlighting theme arrow regarding accessibility.
Fixed an issue with site_generator() detection of a site project (thanks, @bhattmaulik, #2344).
Fixed an issue with Shiny prerendered documents and Pandoc not correctly rendering last Markdown paragraph in HTML (thanks, @gadenbuie, #2336).
Fixed a bug that site_generator() fails to detect the root dir of the site and causes infinite recursion (thanks, @fisher-j, #2339).
html_vignette() gains code_folding argument (thanks, @atusy, #2340).
html_document() can opt-out code_folding = "show" or "hide" for individual code blocks by adding the fold-none class to the code blocks (thanks, @atusy, #2348).
When using a development version of Pandoc, a .9999 suffix is appended to version number so that pandoc_available() can correctly compared version with last release.

rmarkdown 2.13

Fix an issue with older R version and vignette building (#2324).
Fix an issue with older R version and preserve_yaml = TRUE in md_document() (#2325).
Long title in ioslides_presentation failed to work with Pandoc 2.17.x (thanks, @Am386DX-40, #2327).

rmarkdown 2.12

html_document() and html_document_base() gains the math_method argument to support all the math rendering engines from Pandoc: "mathjax", "katex", "mathml", "webtex", and "gladtex". For backward compatibility, the mathjax argument still works and will take precedence over math_method, but we recommend using the new math_method argument instead of the mathjax argument, and the latter could be deprecated in the future.

You can specify a math engine via math_method as an engine name, e.g.,
```
output:
  html_document:
    math_method: katex
```
or provide both a name and a URL (for mathjax, katex and webtex):
```
output:
  html_document:
    math_method: 
      engine: mathjax
      url: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml-full.js
```
For math_method = "katex", KaTeX CDN will be inserted in version 0.15.2 by default (from jsdelivr). A custom URL toward another CDN can be passed as url.

For math_method = "webtex", it will default to inset SVG using https://latex.codecogs.com/svg.image?. Use https://latex.codecogs.com/png.image? for PNG. See https://latex.codecogs.com for supported options (dpi, background, ...).

Most HTML output format using html_document() or html_document_base() as based format should benefit from this new feature. See ?rmarkdown::html_document() for details (thanks, @atusy, #1940).
github_document() also gains the math_method argument set to "webtex" by default so that LaTeX equations can be rendered in the Github Markdown document as images. Previously, LaTeX equations were not rendered. Set math_method = NULL to deactivate.
Added support for katex R package as a math engine with math_method = "r-katex" in HTML documents. This method offers server-side rendering of all the equations, which means no JS processing is needed in the browser as with usual KaTeX or MathJaX methods. (thanks, @jeroen, #2304).
anchor_sections can now be easily customized using style or depth element for anchor_sections. For example:
```
output:
  html_document:
    anchor_sections:
      style: symbol # use symbol style ("hash", "symbol", "icon")
      depth: 2 # max depth to apply anchor on (default to max which is 6)
```
Customizing using a CSS rule is still possible. Detailed explanation and examples have been added to the help page ?html_document.
Improved the highlighting mechanism in formats that supports highlight argument:
- It is now possible to pass a custom theme file .theme in highlight argument for customizing the syntax highlighting style used by Pandoc.
- In addition to Pandoc's own supported themes, two more themes are bundled in the package: highlight: arrow a theme optimized for accessibility and color contrast (thanks to @apreshill), and highlight: rstudio to mimic the RStudio editor theme.
- For HTML output only, added optional downlit support in html_document() for R syntax highlighting and autolinking. Use highlight_downlit = TRUE to activate it (same argument as in distill). This features require the downlit package.
Templates for html_document() and ioslides_presentation() gained a new CSS rule to display single line <summary> content inline (rstudio/rstudio#10589).
md_document() gained a new standalone argument, which is FALSE by default unless toc = TRUE. This allows to output authors, date and other metadata per the Pandoc's template. Due to limitation in how Pandoc is handling metadata blocks in its extensions yaml_metadata_block, preserve_yaml = TRUE now deactivate any extension to let rmarkdown directly handle the keeping of YAML block - this means it does not set standalone = TRUE by default. Meanwhile, github_document() gained the preserve_yaml argument (thanks, @florisvdh, #2297).
Added available_templates() to list all the templates from a specific package that can be used with rmarkdown::draft().
Following support in Pandoc 2.15, powerpoint_presentation() gained a incremental argument as other slide formats. As a reminder, setting incremental = TRUE will make lists to display incrementally. See more in Pandoc's MANUAL.
Added support for Pandoc's dir variable in HTML templates. This is the second Language Variables after lang.
Added a global option rmarkdown.html_dependency.header_attr (TRUE by default). It can be set to FALSE to opt-out the HTML dependency html_dependency_header_attrs() in documents based on html_document_base() (thanks, @salim-b rstudio/bookdown#865, @maelle r-lib/downlit#1538).
Rendering using runtime: shiny_prerendered or runtime: shinyrmd now natively supports custom templates. Previously since 2.8, developers had to add a special comment, , conditionally to shiny-prerendered variable. (See also NEWS from 2.8 for the previous behavior). The new behavior inserts required special comment  as a last element of $header-includes$ . If templates rely on the old behavior and require some contents between $header-includes$ and , consider including them with $header-includes$ (thanks, @atusy, @gadenbuie #2249).
A shiny prerendered document with only a empty server context does not error anymore. Document will be rendered with a empty server function and server.R file will be ignored. To use server.R, no server context should be present in the Rmd document (thanks, @jcheng5, #2305).
Fixed a regression with rendering shiny_prerendered document (thanks, @aronatkins, @gadenbuie, #2218).
Fixed an issue in beamer_presentation() where header-includes would be overwritten by includes = list(in_header =) (thanks, @samcarter, #2294). Same fix as for pdf_document() (#1359).
Fixed broken links to section headers when number_sections = TRUE is specified in md_document and github_document (thanks, @atusy, #2093).
draft() now works with devtools::load_all() and testthat when used in other packages.
Lua Filters: Added two more functions in shared.lua for other package to use:
- Added type() function backward compatible following Pandoc 2.17 changes.
- Added print_debug() for easier logging during debug.
Add opt-in tabset option to the html_vignette. In contrast to the similar feature from html_document, this feature supports navigation from ToC and URL. Any custom formats can introduce this feature by using an exported function html_dependency_tabset() (thanks, @atusy, #2313).

rmarkdown 2.11

Relative paths in parent directories in the css argument of html_document() were incorrectly normalized to absolute paths by #2095 in v2.8. Now relative paths in parent directories will no longer be converted to absolute paths (thanks, @daijiang, yihui/xaringan#331).
It is possible to specify the version of jQuery via a global option now, e.g., options(rmarkdown.jquery.version = 2) (note that the default major version is 3). This is mainly for advanced users and developers to test different versions of jQuery.
pandoc_citeproc_convert() now handles correctly bib file containing specific UTF-8 characters on non default UTF-8 systems like Windows (thanks, @mitchelloharawild, #2195).
Shiny prerendered documents are now pre-rendered in a child environment to avoid allowing the results of static code chunks to exist in the Shiny app environment (@gadenbuie, #2203).
The previously unexported function convert_ipynb() is exported now (thanks, @acircleda).

rmarkdown 2.10

md_document() will now handle correctly preserve_yaml value for all variants and all pandoc versions (#2190).
- with preserve_yaml = TRUE, markdown output will keep the YAML metadata block from the Rmd file.
- with preserve_yaml = FALSE, markdown output will have no YAML metadata block.
This fixes a breaking change in Pandoc 2.13 regarding gfm, commonmark and commonmark_x which now supports yaml_metadata_block by default (#2118).
New supported syntax for Shiny prerendered documents: you can now use server: shiny or server: type: shiny.
Ability to inject additional functions into Shiny prerendered server scope using the "server-extras" context.
Fixed the syntax highlighting issue with R's pipe operator |> (thanks, @edzer, rstudio/bookdown#1157).

rmarkdown 2.9

Fix a regression in version 2.8 when a url is used in css argument (thanks, @vnijs, #2163).
All HTML dependencies are now correctly supported, included those with only an href component but not file component in their src attribute. Previously, rmarkdown would throw the error 'path for html_dependency not provided' when rendering documents containing HTML dependencies with href components (thanks, @crazycapivara, @matthewstrasiotto, #1805, #1948, #2151).
Fix an error thrown with output format using a file_scope function (like in bookdown) (thanks, @rfaelens, #2149).
Fix an issue with copy_ressource = TRUE in html_document_base where very long HTML documents were truncated during post processing (thanks, @oliviermeslin, #2145).
When run()-ing a runtime: shiny document, an extra temp folder will be used in the output path. With the extra temp random folder in the path, predictable output file names may be used. (#2137)
When run()-ing a runtime: shiny document with a {bslib} theme, the global theme value wasn't being restored properly. (#2160)
Floating ToC in html_document can now hide headings with unnumbered and unlisted classes (thanks, @atusy, #1993).
Fix prefix handling in R Markdown website's navbar for Fontawesome V5 and compatibility with V4. For icon only available in V5, the full prefix + name should be use, especially with new fab prefix (e.g. fab fa-r-project). If no prefix is used (e.g fa-home instead of fas fa-home), the fa prefix will be added for V4 compatibility as it has been deprecated in V5. We advice to use the full prefix + name for icons following Fontawesome documentation. (#1994)
rmarkdown::site_generator() can hang session waiting for input when the site field is not found in the YAML frontmatter of index.Rmd (thanks, @kevinushey @mirh, #2043).

rmarkdown 2.8

Fix a issue with Pandoc 2.5 and latex-div.lua - documents can now be rendered as expected without error (thanks, @davidwales, #2121).
Fix an issue with styling and code folding button behavior when default is code-folding: show. The Button can now be correctly style according to state as aria-expanded attributes is correctly updated. Also, new classes has been added on the button to allow styling during transition: btn-collapsing and btn-expanding are respectively applied during transition Show to Hide and Hide to Show. (This follow Bootstrap behavior for the collapsible block) (thanks, @steveharoz, #2085).
Fix an issue with citation_package having no effect when using .md file as input to render() with latex and PDF output formats (thanks, @andrewheiss, #2113).
A new internal option rmarkdown.knit.ext has been added to control the extension of the intermediary knit output during a rendering. It defaults to md to produce *.knit.md. Only useful for very advanced usage (#2098).
render() won't produce any *.utf8.md intermediary file anymore. This was a leftover from previous versions of rmarkdown. Since knitr 1.24 and rmarkdown 2.0, only UTF-8 input files are allowed. (#2098).
Fix an Invalid cross-device link error when tempdir() is used for intermediates_dir in render() (thanks, @gorgitko, #2096).
Fix a regression in HTML default template with floating toc incorrectly placed on small size window (thanks, @grimbough, #2071)
Provided a runtime: shiny fix for output formats that pass a modified bslib::bs_theme() object to html_document_base()'s theme (thanks, @cpsievert, #2049).
Rendering using runtime: shiny_prerendered or runtime: shinyrmd will now produce valid HTML by not inserting anymore the full document as body in the resulting shiny apps (thanks, @dakep, #1912). Header content usually containing html dependencies will be inserted in the HTML document at the end of the head before </head>, unless the rendered HTML contains  special comment (see htmltools::renderDocument()). A new Pandoc variable is set in for shiny prerendered document to allow conditional insertion of such content in the the HTML template using $if(shiny-prerendered)$ . This has been done in all HTML template in this package. Users of custom template should make this change to provide support for this runtime. See rmarkdown default template (default.html) for an example (#2064).
Added tectonic as a supported LaTeX engine for generating PDF output (thanks, @dpryan79, #2078). You can specify to use this by adding engine: "tectonic" to your output format in YAML, such as pdf_document.
When no output_format is provided in any way but an output_file is provided in render(), the default format will be determined based on the extension: "pdf_document" for .pdf, or "word_document" for .docx. Otherwise, it will be "html_document" as previous version (thanks, @pearsonca, #1569).
Added a new global option rmarkdown.render.message. When set FALSE, render() will not output the message starting by Output created: allowing RStudio IDE to open a preview of the document. This is useful for package developers that would need to emit there own output message for there custom format. See ?render_site for more info on this special message (#2092).
Internal changes regarding Lua filters. They have now an explicit Pandoc version minimal requirement: A filter will be skipped with a warning printed by the Lua filter if this requirement is not met. For now, all filters work for Pandoc 2.1 and above (thanks, @atusy, #2088). There is also now a new mechanism to have a share Lua filter script loadable by other Lua files: render() will set the RMARKDOWN_LUA_SHARED env var to the path of Lua filter shared.lua so that other filters can access functions defined in it using dofile(os.getenv 'RMARKDOWN_LUA_SHARED'). This is for internal usage only to avoid duplication (thanks, @tarleb, #2103).
html_document_base gains a css argument, to which html_document's css argument is now passed. This also fix an issue when .sass or .scss files are used with this css argument when self_contained: FALSE. Moreover, sass caching mechanism can now be used when passing .sass or .scss files to the css argument (thanks, @cpsievert, #2095).
The fig_crop option of PDF document formats (such as pdf_document and beamer_presentation) supports the value "auto" now, which means fig_crop = TRUE when figure cropping tools pdfcrop and ghostscript are available.
The default value of the fig_crop option of PDF output formats has been changed from TRUE to "auto" (#2077).
rmarkdown::tufte_handout has been deprecated and will be removed in the future from this package. It has been moved to the tufte package since rmarkdown 0.9.5 (released on 2016-02-22). Please use tufte::tufte_handout instead.

rmarkdown 2.7

html_document (and html_document_base)'s theme parameter now understands bslib::bs_theme() objects/arguments, meaning that one may opt-into Bootstrap 4 and more easily create custom themes. For examples, see rstudio#1706, and for context, see https://rstudio.github.io/bslib/ (thanks, @cpsievert, #1706).
Files with .scss/.sass extension (i.e., Sass files) provided to html_document's css parameter are now compiled to CSS using the {sass} package. Also, if theme is a {bslib} object, these Sass files may utilize Sass code inside the theme (thanks, @cpsievert, #1706).
Fix an issue with line numbering in code chunks when .numberlines with Pandoc's highlighting (thanks, @aosavi, #1876).
Fix an issue with shiny runtime and global.R (thanks, @liaojiahui-r, rstudio/flexdashboard#298).
Accept latex="{options}", latex=1, or latex=true for Latex Divs.
Add output_format_filter function to default_site_generator(). Enables custom site generators to customize or even entirely replace the output format right before rendering of each page.
Automatically exclude renv directory for render_site() (thanks, @jmbuhr, #1996)
Do not force options(htmltools.preserve.raw = TRUE) when this option has been set, otherwise it is impossible for other packages to turn this option off, e.g., yihui/xaringan#293.
knitr_options_pdf() will now throw a warning when fig_crop = TRUE but is disabled because required tools pdfcrop and/or ghostscript are missing (thanks, @netique, #2016).
Eliminated the unnecessary padding in code blocks in the html_document output with Bootstrap 4 themes (thanks, @atusy, #2019).
github_document() will produce a working TOC even if some headers start with number (#2039).
Fix an issue with knit_print.data.frame. The ... arguments are no more passed to print() to avoid passing knit_print() arguments options and encoding to custom print() methods (#2047).

rmarkdown 2.6

Encoding is correctly handled now in html_vignette when checking for identical title and vignette index entry (thanks, @py-b, #1978).
clean_site() now default to preview = TRUE and will no more remove files without notice. This change will affect the "Clean All" button in the "Build" pane for website project. clean_site(preview = FALSE) must be run to effectively remove files (#1973).
The intermediate .tex file is now correctly deleted if keep_tex = FALSE when the R Markdown document is not rendered from the working directory (thanks, @vqv, #1308).
Fix a bug causing certain resources files to be deleted as intermediate files when intermediates_dir is the same as the input (thanks, @bellma-lilly, #1248).
Fix issues with anchor_sections = TRUE and learnr (thanks, @gadenbuie, #1938).
Enable use of server.R and global.R alongside runtime: shinyrmd documents.
pkg_file_lua() now works with devtools::load_all() and testthat when used in other packages.
Fix pandoc_convert(citeproc = TRUE) not supressing the --natbib or --biblatex options (thanks, @atusy, #1932).
pandoc-citeproc is now activated if a bibliography field is defined in another YAML block instead of the first YAML block (thanks, @bwiernik, #1364).
Specify that htmltools::htmlPreserve() should use the pandoc raw attribute rather than preservation tokens when pandoc >= v2.0. Note that this option will have the intended effect only for versions of htmltools >= 0.5.0.9003.
anchor_sections in html_documents() now defaults to FALSE. It was introduced in previous version with a default to TRUE, but it is reverted now after hearing feedbacks from the community (thank you!). The # is still used as the character for the anchor but you can easily change that using CSS rules. Examples have been added to the help page ?html_document.
Using Pandoc's default for --email-obfuscation now. Previously, it was set to none explicitly, which is the default for Pandoc 1.17.2+ anyway. Only users with a Pandoc version before 1.17.2 may see a change in the content of the html source file produced if the document contains email addresses. This change allows to pass the Pandoc's command line flag if you want to set it to another value (thanks,@seankross, #1969).
```
output:
  html_document: 
    pandoc_args: ["--email-obfuscation", "javascript"]
```
See Pandoc's manual for the meaning of this option.
Fix Fontawesome 5 icons in navbar by correctly handling new prefix as fa has been deprecated in favor of fas or fab (#1967)

rmarkdown 2.5

Tables without header rows (wich can be possible in Pandoc's simple table) are now formatted correctly when using html_document() format (thanks, @fkohrt, #1893).
html_document() gains the anchor_sections argument, which is TRUE by default, so that readers can get links to section headers easily---when you mouse over a section header, you will see a hash symbol # at the end of the header, which contains the anchor link to this header. You can click on this link and get the URL in the addres bar of your web browser, or right-click on it and copy the URL from the context menu. The hash symbol is defined by the CSS rule a.anchor-section::before {content: '#';}. You can customize it by overriding this rule (e.g., via the css argument of html_document) and use any other symbols or icons, e.g., content: "\02AD8;" (thanks, @atusy, #1884).
pkg_file_lua() should have thrown an error if the expected Lua file does not exist.
Provide files_dir and intermediates_dir as attributes on return from render() when run_pandoc = FALSE.
Supports new Pandoc 2.11 --citeproc flags usage instead of pandoc-citeproc external filter. pandoc_convert() and pandoc_citeproc_convert() will now use the correct flags according to the Pandoc version used. The logic is exported in pandoc_citeproc_args(). See Pandoc release note for more information about the new citeproc processing (#1916).
Fixed the code highlighting when code block is hidden. Previous version introduced a regression where non default code highlighting was still shown when code_folding is activated and code block is hidden (thanks, @matthewcarlucci, #1921).
The minimal required version for the xfun package (v0.15) has been specified for R Markdown Notebooks to work properly (thanks, @jmcphers, #1923).
Fixed a bug in convert_ipynb() when the language is not specified in the .ipynb file (thanks, @acca3003, #1925).
Introduce runtime: shinyrmd as a more user friendly alias for runtime: shiny_prerendered.

rmarkdown 2.4

Lua filters handling has been improved internally with some user-facing changes (#1899):
- New exported function pandoc_lua_filter_args() to return the Pandoc command-line argument to add a Lua filter.
- New argument lua_filters in pandoc_options() to pass the Lua filter paths to use with a format. This allow output format authors to add filters for a custom format using the pandoc argument of output_format() and to get filters from a format using fmt$pandoc$lua_filters.
- The Lua filters of an output format are now passed to Pandoc in render(). By default, they are passed to Pandoc before any other format-defined or user-defined Pandoc arguments (usually via the pandoc_args option of an output format). This ensures that filters of an output format are executed first. To change the default, you need to deal with it in a custom format (i.e., modify the elements in fmt$pandoc$lua_filters, such as reordering them).
- New exported function pkg_file_lua() to get the full system path of a Lua filter included in a package source within the inst/rmarkdown/lua folder (thanks, @atusy, #1903).
Fixed the path separators for the css parameter in YAML frontmatter for HTML output files under Windows. Previously, forward slashes in css paths were converted to backslashes (thanks, @jonathan-g, #1862).
Since rmarkdown 1.16, Pandoc's fenced Div's are converted to LaTeX environments when the output format is LaTeX, e.g., ::: {.center data-latex=""} is converted to \begin{center}. The attribute data-latex of the Div was mandatory, even if it is empty. In rmarkdown 2.2, we silently drop this requirement, which means ::: {.center} is converted to \begin{center}. This turns out to be a bad idea, because users have no control over which Div's to be converted to LaTeX environments. Previously, they could opt-in by the data-latex attribute, but with rmarkdown 2.3, all Div's are converted to LaTeX environments unconditionally. What's more, this change led to bugs like https://stackoverflow.com/q/62340425/559676 and rstudio/bookdown#883. Therefore the data-latex attribute became mandatory again in this version. If the LaTeX environment does not need arguments, you may use data-latex="".
The two Lua fitlers pagebreak.lua and latex-div.lua (introduced in rmarkdown 1.16) are also applied to the output format beamer_presentation now (thanks, @XiangyunHuang, #1815).
When customizing formats with the output_format function, pre_knit, opts_hooks, and knit_hooks can now refer to rmarkdown::metadata. Previously, rmarkdown::metadata returned list() in these functions (thanks, @atusy, #1855).
rmarkdown::find_external_resources() now discovers external template files. This in turn fixes the rendering issue of html_document with the shiny runtime and intermediate_dir set (thanks, @atusy, @cderv, #1865).
Added the number_sections argument to following formats: github_document, ioslides_presentation, md_document, odt_document, powerpoint_presentation, rtf_document, slidy_presentation, word_document. These are powered by a Lua filter and requires Pandoc > 2.0. It will silently have no effect has before with previous pandoc version (thanks @atusy 1893). Pandoc >= 2.10.1 adds --number-sections for docx format, and thus word_document prefers the native feature to the Lua filter (thanks, @jooyoungseo, #1869).
For the output format pdf_document, the option fig_crop will not be enabled unless both the programs pdfcrop and ghostscript are found (thanks, @dalupus, yihui/knitr#954).
Fixed a bug that a chunk with a class fold-hide hides the rest of the chunks even the output format setting html_document(code_folding = "show") (thanks, @atusy, #1906).
Updated documentation for render() to make it clearer how options are set for the output_format parameter (thanks, @jonathan-g, #1907 and rstudio/bookdown#930).
Ported some CSS styles (e.g., underlines, small caps, and multi-column layouts) from the latest Pandoc's HTML template into rmarkdowns HTML templates (thanks, @atusy, #1878, #1908).

rmarkdown 2.3

Addressed an accessibility issue in highlighted code blocks of HTML output for screen reader users: screen readers no longer read out an unnecessary code line id values (thanks, @jooyoungseo and @atusy, #1833).
Added file_scope option to output format definition. This enables handling of duplicate numeric footnote identifiers (e.g. across bookdown chapters) via the pandoc --file-scope option (#1837).
Added the customizable lang attribute to ioslides_presentation output (thanks, @jooyoungseo, #1841).
Added publish_site() function for "one-button" publishing of R Markdown websites.
When the df_print option is kable and the output format is not HTML, <div class="kable-table"> is no longer added to the kable() output, because recent versions of Pandoc will convert the div to a LaTeX environment when the output format is LaTeX (thanks, Laurens, https://stackoverflow.com/q/62340425/559676).
html_vignette() only warns against differences in the vignette title and the vignette index entry for R >= 3.6.0 (thanks, @krlmlr, #1832).
html_document() can apply code_folding on any chunk engines if the foldable class is added to a source code block via the chunk options (class.source or attr.source). You may apply this feature to all the source code blocks, for example, by setting knitr::opts_chunk$set(class.source = "foldable") at the beginning of your document (thanks, @atusy, #1835).

rmarkdown 2.2

Exported the internal function find_pandoc(), and also added two arguments, dir and version, so that users can provide a custom directory under which this function may find Pandoc, as well as an expected version of Pandoc to be found (thanks, @connorp, #1785).
pandoc_metadata_arg() is a new Pandoc helper function to generate --metadata argument for Pandoc command line (thanks, @cderv, #1789).
The output format html_vignette() now warns against differences in the vignette title specified in the title field in the YAML metadata and the one specified inside \VignetteIndexEntry{}. Normally they are expected to be identical (#1789).
Fixed a bug with encoding when rendering html_notebook containing HTML widgets (thanks, @cderv, #1799).
TOC title can now be specified for html_document via the top-level option toc-title in the YAML frontmatter (thanks, @atusy, #1771).
Floating TOC can now distinguish upper/lower-cases (thanks, @atusy, #1783).
When code_folding='show' for the output format html_document, code blocks can be individually hidden initially by specifying the chunk option class.source='fold-hide' (thanks, @atusy, #1798).
For LaTeX/PDF output formats pdf_document, beamer_presentation, and context_document, the argument citation_package = 'none' was deprecated, and citation_package = 'default' should be used instead if citations are to be processed by pandoc-citeproc (thanks, @njbart, rstudio/bookdown#754).
output_format() can now inherit keep_md and clean_supporting from base_format when NULL is passed to these arguments. Previously, you must explicitly specify keep_md and/or clean_supporting as TRUE or FALSE in output_format() since they could not inherit the corresponding options of base_format. This behavior was not consisent with other arguments of output_format() (thanks, @atusy, #1823).
The smart argument of most output formats has been removed, because Pandoc's smart extension is enabled by default, and setting smart: false for an output format did not really have any effect (which could be considered a bug, but we want to get rid of this option since it existed only for a historical reason for Pandoc 1.x, and Pandoc 2.x has been released for more than two years). If you want to disable the smart extension, you can use the option md_extensions: -smart of the output format (thanks, @atusy, #1774).
pdf_document() should not specify the geometry variable when the documentclass variable is passed to Pandoc (thanks, @jpcirrus, #1782).
render() now respects the YAML metadata in the R script when rendering the script with Pandoc 2.8 or later (thanks, @nsoranzo #1740, @cderv #1741).
For pandoc_convert(), when the argument to = 'pdf', it will be changed to 'latex' internally (thanks, @JohannesFriedrich, #1802).
render(run_pandoc = FALSE) no longer cleans up the Markdown file (typically knitted from Rmd) (thanks, @BrianDiggs, #1812).

rmarkdown 2.1

Added the returned output from shiny::runApp() within rmarkdown::run() (thanks, @schloerke, #1760).
YAML header is now correctly parsed in html_notebook's intermediate .knit.md file so that features like adding bibliography works again (thanks, @everdark, @cderv, #1747).
ioslides_presentation template no longer generates an empty <h2> tag when subtitle is not specified in YAML (thanks, @jooyoungseo #1735, @cgrudz #1663).
No longer center the #header element in the html_vignette() output (thanks, @EmilHvitfeldt, #1742).
Ensure the tempdir() exists (via tempdir(TRUE)) when writing HTML dependencies to a temporary file, because this directory might be erased by accident (thanks, Kurt Hornik, and also @karawoo #1743).
Added the slide_level argument to slidy_presentation() (https://stackoverflow.com/q/59157211/559676).
Removed the jQuery dependency in html_document_base() (#1723). To avoid bugs like #1723, Pandoc 2.8 users have to upgrade to Pandoc 2.9+.
For pdf_document, horizontal rules generated by Pandoc (before v2.8) stopped working in recent versions of TeX Live, and the same fix as the one to jgm/pandoc#5801 (i.e., hard-code \linethickness to 0.5pt) was applied in rmarkdown (thanks, @cderv, https://stackoverflow.com/a/58646915/559676).

rmarkdown 2.0

For the output format pdf_document(), we no longer adjust the vertical spacing of the title area. This means there will be a larger spacing above the document title in PDF. If you prefers the old (smaller) spacing, please download https://github.com/rstudio/rmarkdown/blob/f6961af/inst/rmd/latex/compact-title.tex and include it to the preamble via the includes option of pdf_document. However, please note that this means you won't be able to have multiple authors in the author field of the YAML frontmatter, unless you use a custom LaTeX template. With the default LaTeX template, you will run into the error in #1716. Besides, the compact-title option in YAML is no longer supported.
R code in the header-includes field in the YAML frontmatter stopped working in the previous version of rmarkdown. The code should be evaluated before passing to Pandoc (thanks, @mcol #1709, @cderv #1710).
The encoding argument is no longer passed to the intermediates_generator of R Markdown output formats. The intermediates_generator function can only accept arguments input_file and intermediates_dir now (see ?rmarkdown::output_format). This is a breaking change to developers. If you are an output format developer, you have to remove the encoding argument in your intermediates_generator if your output format uses this function.
The encoding argument is no longer passed to the render element of the site generator (see ?rmarkdown::render_site).
The encoding argument has been removed from many of the internal functions in the rmarkdown package. Now all input files are assumed to be encoded in UTF-8. If you see an error message like "Error in FUN(arg = ...): unused argument (arg = ...)", please file an issue (with a reproducible example) to https://github.com/rstudio/rmarkdown.
Added a new output format context_document() to support ConTeXT output (thanks, @RLesur #1725, @jooyoungseo #1713).
render_site() can render R scripts in addition to Rmd files if you set autospin: true in _site.yml (thanks, @zeehio, #1564).
Added ext argument to md_document(). Its default value is ".md". This argument is intended to be used together with variant argument (e.g., variant = "context" and ext = ".pdf") (thanks, @atusy, #1715).
ioslides_presentation() stylesheet is updated for printing. Browsers are notified that the presentation should preferentially be printed in landscape orientation and without margin (thanks, @RLesur, #1718).
Reverted the fix #1703 and applied an alternative fix to #1700, because the original fix brought a new bug #1714 (thanks, @pablobernabeu @cderv @everron @aronatkins).
Tabsets don't work with Pandoc 2.8 (thanks, @mnazarov, #1723).
The pdf_document format failed to work if the header-includes field in YAML is an empty list (thanks, @cderv, #1728).

rmarkdown 1.18

For pdf_document(), now we patch Pandoc's built-in LaTeX template to include the document subtitle (unnecessary with pandoc 2.6 onwards) and reduce the vertical spacing before title using --include-in-header rather than overwriting the built-in template, avoiding compability problems with newer versions of Pandoc (thanks, @adunning, #1563).
find_external_resources() works now when multiple files are specified in the includes option of the output format (thanks, @andrie, #1677).
find_external_resources() can find external resources specified in the output format's reference_doc or reference_docx option now (thanks, @jmcphers, #1696).
rmarkdown::run(file = NULL, dir = "foo/") failed to run Rmd files under the foo/ directory (thanks, @jenzopr, #1703).
Reverted the fix for #1692 since it is no longer necessary (rstudio/tinytex#152 (comment)).
The header-includes field in the YAML metadata will no longer be overwritten by the command-line option --include-in-header (thanks, @crsh @mnazarov, #1359).
Removed the xmlns attribute in the <html> tag in the default HTML template (thanks, @grady #1640, @spgarbet #995).

rmarkdown 1.17

html_vignette() passes self_contained argument value to base format (thanks, @cderv, #1668).
find_external_resources() works for the html_vignette type again, this fixes rendering vignettes with external resources in pkgdown (regression introduced in rmarkdown 1.16, #1668).
render(..., clean = TRUE) may fail to clean the *_files directory when the output format is prettydoc::html_pretty (thanks, @yixuan, #1664).
For ioslides_presentation, images with atributes (e.g., ![](sample.png){width=80%}) can be correctly embedded in the self-contained mode now (thanks, @hadley, #1687).
Fixed the Pandoc LaTeX templates to avoid the error File grffile.sty' not found`. This is because the LaTeX grffile is no longer available in TeX Live (thanks, @cderv #1691, @smmurphy #1692, @JacobD05 rstudio/tinytex#152).

rmarkdown 1.16

The pandoc-citeproc binary can now be found correctly on Windows. This fixes an issue with pandoc_citeproc_convert() (thanks @cderv, #1651).
Added self_contained argument to html_vignette to keep intermediate directory if self_contained = FALSE (thanks, @cderv, #1641).
It is now possible to add pagebreak in HTML, Word, LaTeX, and ODT documents using the \newpage or \pagebreak command in an Rmd file. This is possible thanks to the Pandoc's pagebreak Lua filter. See vignette("lua-filters", package = "rmarkdown") (thanks, @cderv, #1626).
The Pandoc extension ascii_identifiers is no longer enabled by default. If you still need it, you may use the argument md_extensions = "+ascii_identifiers" in the output format function. However, please note that this will trigger an error in a future version of Pandoc.
Output formats can be configured by arbitrary YAML files, which used to be restricted to _output.yml or _output.yaml. They can be specified via the output_yaml argument of render() or the output_yaml top-level parameter of YAML front matter, and the first existing one will be used. If output_yaml is specified both for render() and YAML front matter, then render() has the priority. If none are found, then _output.yml or _output.yaml will be used if they exist (thanks, @atusy, #1634).
Added a Pandoc Lua filter to convert fenced Divs to LaTeX environments when the output format is latex or beamer. Basically a fenced Div ::: {.NAME data-latex="[OPTIONS]"} is converted to \begin{NAME}[OPTIONS] \end{NAME} in LaTeX. The attribute data-latex must be provided, even if it is an empty string (meaning that the LaTeX environment does not have any optional arguments). For example, ::: {.verbatim data-latex=""} generates a verbatim environment, and ::: {.minipage data-latex="{.5\textwidth}"} generates \begin{minipage}{.5\textwidth}. This Lua filter was originally written by @RLesur at yihui/bookdown-crc#1. It will allow users to create custom blocks that work for both HTML and LaTeX output (e.g., info boxes or warning boxes).
Added keep_html argument to github_document so to save a preview HTML file in a working directory (thanks, @atusy, #1650).

rmarkdown 1.15

Exclude README.R?md from files processed by render_site(),
html_document with code_folding: hide supports showing individual source code chunks if they are assigned the fold-show class via the chunk option class.source="fold-show" (thanks, @atusy, #1602).
The extra_dependencies argument only works with template: default in pdf_document. Now it works with any Pandoc LaTeX templates as long as the template uses the header-includes variable.

rmarkdown 1.14

Fixed a regression in ioslides_presentation that background colors via the data-background attribute on slides stopped working (thanks, @ShKlinkenberg, #1265).
Fixed the bug #1577 introduced in rmarkdown v1.12: tabsets, floating TOC, and code folding in the html_document format no longer work with the shiny runtime (thanks, @RLesur for the fix #1587, and @fawda123 @ColinChisholm @JasonAizkalns for the bug report).
Added the keep_md argument to pdf_document() to keep the intermediate .md output file (thanks, @broomej, #1001).
For render(), if the input filename contains special characters such as spaces or question marks (as defined in rmarkdown:::.shell_chars_regex), the file will be temporarily renamed with the special characters replaced by - (dash) instead of _ (underscore, as in previous versions of rmarkdown). This change will affect users who render such files with caching (cache will be invalidated and regenerated). The change is due to the fact that - is generally a safer character than _, especially for LaTeX output (#1396).
Added a pkgdown site for the rmarkdown package: https://rmarkdown.rstudio.com/docs/ (thanks, @apreshill, #1574).
Fixed the bug #1593: in HTML documents, when a MathJax URL is used with a custom template, the source code of the MathJax library is included in the document. This bug was first declared in bookdown (thanks, @topepo for the bug report rstudio/bookdown#683, and @RLesur for the fix #1594).

rmarkdown 1.13

For pdf_document(), do not override margins to 1 inch when a custom document class or geometry settings are specified in the YAML front matter (thanks, @adunning, #1550)
The default value of the encoding argument in all functions in this package (such as render() and render_site()) has been changed from getOption("encoding") to UTF-8. We have been hoping to support UTF-8 only in rmarkdown, knitr, and other related packages in the future. For more info, you may read https://yihui.org/en/2018/11/biggest-regret-knitr/.
The option toc_float: true for html_document now preserves the text formatting (thanks, @codetrainee, #1548).
For the output_file argument of render(), a file extension will be automatically added if the filename does not contain an extension (e.g., render('foo.Rmd', 'html_document', output_file = 'bar') will generate bar.html); see the help page ?rmarkdown::render for details (thanks, @apreshill, #1551).
TOC items are not correctly indented when toc_float is enabled for the html_document format (thanks, @carolynwclayton #1235 and @RLesur #1243).
Fixed rstudio/shiny#2307 where the second execution of a shiny_prerendred document with href dependencies would cause a prerender check error (thanks, @schloerke, #1562).
The *_files directory is not properly cleared due to the inappropriate fix for #1503 and #1472 in the last version (thanks, @wxli0 #1553, @cderv #1566).
Added an output_extensions argument to pdf_document() to make it possible to enable/disable Pandoc extensions for the LaTeX output format (thanks, @hongyuanjia, rstudio/bookdown#687).

rmarkdown 1.12

Fixed file extensions of output files when using non-markdown Pandoc extensions such as docx+styles (#1494, @noamross).
Added a new argument extra_lines to latex_dependency() to allow users to add extra lines of LaTeX code after \usepackage{}. Also added a helper function latex_dependency_tikz() based on latex_dependency() (#1502, @malcolmbarrett).
Fixed #1529: when the path of an Rmd file contains Unicode characters that cannot be represented in the system native encoding (especially on Windows), rmarkdown::render() may fail.
Applied a correct fix to an old plotly issue plotly/plotly.R#463.
HTML widgets used to be hidden when printing ioslides to PDF in Chrome. Now they will be printed correctly.
render(output_format = 'all') may delete the figure directories that are still needed by certain output formats when one output format doesn't need its figure directory (thanks, @rmcd1024 #1472, @cderv #1503).
The <em> tags in the subtitle, date, and author are removed from the default HTML template (thanks, @royfrancis, #1544).

rmarkdown 1.11

Fixed #1483, which prevented the triangle to be displayed in Firefox when <details><summary>...</summary></details> was used (#1485, @bisaloo)
Provided rmarkdown.pandoc.args as a knitr package option in knitr::opts_knit (#1468, @noamross).
Added the exported function pandoc_exec(), which returns the path of the pandoc binary used by the package (#1465, #1466 @noamross).
new_session: true in _site.yml causes render_site() to render each file in a new R session, eliminating some cross-file difficulties, such as function masking (#1326, #1443 @jennybc).
Added the LaTeX command \passthrough in the default LaTeX template for the --listings flag of Pandoc (rstudio/bookdown#591).
The icons in flexdashboard::valueBox() are not of the full sizes due to the upgrade of FontAwesome in #1340 in the previous version (#1388, rstudio/flexdashboard#189).
Added the ability to generate tabset dropdowns, usable by adding the .tabset-dropdown class to a header (e.g., # Heading {.tabset .tabset-dropdown}) (#1405). Thanks @stefanfritsch for contributing the necessary code for this (#1116).
The darkly theme (a darker variant of the Bootswatch flatly theme) has been added to html_document and html_notebook (#1409, #889).
Fixed a regression that caused scrollbars on code blocks when the syntax highlighting theme is not the default (#654, #1399).
Fixed #1407: reactive expressions can break the section headers of Shiny R Markdown documents.
Fixed #1431: render() with the intermediates_dir argument when the output format is powerpoint_presentation with a custom reference_doc fails to find the reference document.
Fixed the website navbar not being able to display submenus properly (#721, #1426).
Added checks for shiny-prerendered documents to find all html dependencies, match all execution packages, and match the major R version (#1420).
Added an argument cache = TRUE to the internal function rmarkdown:::find_pandoc(), so that users can invalidate the cached path of Pandoc via rmarkdown:::find_pandoc(cache = FALSE) (thanks, @hammer, #1482).
Added an RStudio project template for simple R Markdown websites, so that users can create such websites from RStudio: New Project -> New Directory -> Simple R Markdown Website (thanks, @kevinushey, #1470).
Fixed #1471: Pandoc's (version 2.x) syntax highlighting themes don't work well with the Bootstrap style (thanks, @gponce-ars #1471, @cderv #1489).
Fixed the warnings in #1224 and #1288 when calling render() with an absolute output_dir or intermediates_dir.
Fixed #1300: calling render() with intermediates_dir may fail when the intermediate dir is on a difference device or filesystem.
Fixed #1358: calling render() with intermediates_dir will fail if the Rmd document contains bibliography files that are dynamically generated.

rmarkdown 1.10

Added a new argument slide_level to powerpoint_presentation() (#1270).
The tinytex package has become a required dependency (to build R Markdown to PDF).
Added compact-title variable to the LaTeX default templates to control use of LaTeX titling package; defaults to true (#1284).
pdf_document(template = NULL) does not work (#1295).
Restore ability to use any HTML format with R Markdown Websites (#1328).
Add options argument to paged_table() to enable explicit passing of display options.
Add pandoc_citeproc_convert() function for conversion of bibliography files (e.g. BibTeX files).
Update to Font Awesome version 5.0.13 (#1340).
Add site_resources() function for computing resource files required for a website.
Export default_site_generator() function.
The latex_document() format should not clean up the figure directory (thanks, @emiltb, rstudio/bookdown#582).
Enable post processors that change the output file to specify that the base post processor should still be applied to the original output file.

rmarkdown 1.9

NEW FEATURES

Added a new (experimental) output format powerpoint_presentation. If you want to test it, you will need Pandoc >= 2.1 (#1231).

MAJOR CHANGES

If the tinytex package is installed, PDF output is built through tinytex::latexmk(), otherwise it is generated by rmarkdown:::latexmk(), which has been factored out and improved in the tinytex package, so it is recommended that you install the tinytex package (#1222).

BUG FIXES

Temporary files created in render() may be cleaned up prematurely, which can cause problems with Shiny R Markdown documents (#1184).
Further improvements regarding compatibility with Pandoc 2.0, e.g. tabbed sections don't work (https://community.rstudio.com/t/3019).
When preserve_yaml = TRUE in md_document(), toc = TRUE fails to create the table of contents (thanks, @stla, #1216).
Suppress confusing error messages from knitr::purl() during rmarkdown::find_external_resources() (thanks, @aronatkins #1247, and @paulobrecht #1154).
Fixed the obscure error Error: path for html_dependency not found:, which was due to the HTML dependency of highlight.js (thanks, @bborgesr, #1213).

rmarkdown 1.8

BUG FIXES

render_site() does not work with _site.yml that does not have the output setting (#1189).
The variables input and output do not work in Shiny R Markdown documents (#1193).
ioslides_presentation fails to embed images (#1197).
With Pandoc 2.x, github_document() generates the wrong filename extension .gfm-ascii_identifiers instead of .md, and line height of code blocks in the HTML preview is too big (#1200).

rmarkdown 1.7

Fixed an issue with df_print: paged where row names where not printed and added support for rownames.print option to control when they print.
Add smart option for word_document() format.
Save render intermediates when generating beamer presentations (fixes #1106).
Fixed issues when specifying NULL/null/empty parameter values (#729 and #762).
Better error message when unable to prerender a document. (#1125)
shiny::renderText() does not work in Markdown section headings (#133).
The value argument of pandoc_variable_arg() can be missing now (#287).
Background colors and images are supported for ioslides presentations (#687).
HTML widgets in an Rmd document cannot be rendered if another Rmd document is rendered via rmarkdown::render() in this document (#993).
Try harder to clean up temporary files created during render() (#820).
Wrong environment for evaluating R code chunks in Shiny R Markdown docs (#1162, #1124).
Do not call bibtex to create the bibliography when there are no citations in the document and the output format is pdf_document() with citation_package = 'natbib' (#1113).
render() will stop if the output format is PDF but there are any errors during building the index or bibliography (#1166).
beamer_presentation() doesn't work when citation_package != 'none' (#1161).
File-based inputs don't work in parameterized documents (#919).
rmarkdown is compatible with Pandoc 2.0 now (#1120).
render() with intermediates_dir fails with R plots (#500).
Added two new output formats latex_document() and latex_fragment() (#626).
Relative paths of images in HTML output should not be resolved to absolute paths (#808).
render_site() does not support multiple output formats for a single Rmd (#793).
Unicode characters may be scrambled when downloading the Rmd source file using the download button generated by html_document(code_download = TRUE) (#722).
Upgraded highlight.js from v1.1 to v9.12.0 (#988, #907).
The argument keep_md = TRUE actually preserves the Markdown output file from knitr::knit() now (as documented). Previously, it generates a new Markdown file by concatenating the YAML metadata (title, author, date) with the body of the original Markdown output file (#450).
For md_document(), when variant == 'markdown' and perserve_yaml = TRUE, the Pandoc argument --standalone should not be used (#656).

rmarkdown 1.6

Fixed an issue where headers with non-ASCII text would not be linked to correctly in the table of contents.
Support code folding for bash, python, sql, Rcpp, and Stan chunks.
Provide rmarkdown.pandoc.id_prefix as Knit option
Fixed two issue with df_print: paged, one would prevent rendering data with lists of lists and the other where the column type would get cut off.
Better support for citation_package: biblatex in pdf_document() (#1062).
On certain Windows platforms, compiling LaTeX to PDF may fail because system2(stdout = FALSE) is not supported, in which case the default system2() will be used (#1061).
Allow paged tables to render even when page load / visibility has a long delay

rmarkdown 1.5

Fixed an issue where code within Shiny pre-rendered documents was not rendered correctly.
Add includes parameter to html_fragment format.
Use RStudio redirection URL to replace deprecated MathJax CDN

rmarkdown 1.4

data.table expressions involving := are no longer automatically printed within R Markdown documents. (#829)
Fix #910: the extra_dependencies argument of pdf_document() does not work when no code chunks contain LaTeX dependencies.
The extra_dependencies of pdf_document() can also take a character vector of LaTeX package names, or a named list of LaTeX package options (with names being package names), which makes it much easier to express LaTeX dependencies via YAML.
Automatically ignore packrat directory for render_site
Fix #943: escape end tags in shiny_prerendered code contexts
Add support for sticky tabs in html_document via tabset-sticky class
Process Rmd files with lowercase extension (.rmd) in render_site
Fix stack space consumption issues with large JS payloads in chunks
Add section_divs argument to html_document and html_fragment to control generation of section tags/divs.
Remove data-context="(data|server|server-start)" chunks from HTML served to client in shiny_prerendered

rmarkdown 1.3

Fix v1.2 regression in ordering of CSS for ioslides_presentation.
Fix rendering of pagedtables within html_notebook format.
Ensure that html_prerendered UI is never cached.
Add citeproc argument to YAML header; controls whether pandoc-citeproc is used (#831)

rmarkdown 1.2

Add support for df_print to handle additional dplyr classes: grouped_df, rowwise_df and tbl_sql.
Add new runtime: shiny_prerendered mode for interactive documents.
Prepend "section-" to ids in runtime: shiny[_prerendered] to eliminate potential conflicts with shiny output ids
Use html_dependencies for highlight.js, pagedtables, slidy, ioslides, & navigation (improved dependency behavior for runtime: shiny[_prerendered])
Serialize runtime: shiny[_prerendered] dependencies to JSON rather than .rds
ioslides: check for null before concatenating attr["class"] (#836)
Add rmarkdown.onKnit/onKnitCompleted package hooks
Non-ASCII keys in yaml file should be marked to UTF8 as well, when read into R as the name of a list (#841)
Remove key-column special-case left alignment in pagedtables (#829)
Replace backslashes in floating TOC headings (#849)
Suggests rather than Imports for tibble (R 3.0 compatibility)
Add paged_table function for printing paged tables within HTML documents
Support {.active} attribute for setting initially active tab (#789)
Add knit_root_dir argument to render() and YAML header, a convenience for setting knitr's root.dir option
Improve alignment of text in sub-topics for floating TOC
Bibliography file paths in YAML containing forward slashes could not be rendered (#875)

rmarkdown 1.1

Fixed an issue where attempts to render an R Notebook could fail if the path contained multibyte characters.
Fixed an issue where the default Beamer template did not provide vertical padding between paragraphs with certain versions of pandoc (<= 1.17.2).
Try to install latexmk automatically on Windows
Added df_print option to html_document format for optionally printing data frames using knitr::kable, the tibble package, or an arbitrary function
Fix for render_site not showing Chinese characters correctly
Fix for ignoring knit_meta that is explicitly passed to render
Parameter editing: don't allow NULL to overwrite previous state
Parameter editing: fix incorrect name for parameters with expressions
Parameter editing: allow multiple values when the parameter is configured to use a "multiple" selector
Switched the order in which format dependencies are added for html_document so that extra_dependencies are added at the end, after bootstrap, etc. (#737)
pdf_document(keep_tex = TRUE) will generate the .tex document even if PDF conversion fails (#779).
Move latex header includes to just before \begin{document}
Special 'global' chunk label for runtime: shiny which designates a chunk to be run once and only once in the global environment (startup performance improvement for multi-user shiny documents)
Ensure supporting files are writeable (#800)
Make the "show code" buttons more CSS-friendly (#795)
Exclude output_dir from site files (#803)
Export navbar_html and yaml_front_matter functions

rmarkdown 1.0

toc_float no longer automatically sets toc = TRUE
Added an argument error to pandoc_available() to signal an error when (if error = TRUE) pandoc with the required version is not found.
Added html_notebook format for creating HTML documents that include source code and output.
Added resolve_output_format function (useful for front ends that need to mirror the default format resolution logic of render).
Added code_download option to html_document to provide an option to embed a downloadable copy of the Rmd source code within the document.
Added slide_level option to ioslides_presentation to set the level of heading used for individual slides.
Added hard_line_breaks option to github_document to deal with change in behavior of GitHub's markdown renderer with respect to line breaks.
Use "markdown_strict" rather than "markdown" for pandoc_self_contained_html when pandoc >= 1.17 (pandoc hanging bug was fixed in this version)
Default highlighting engine for html_document now highlights bash, c++, css, ini, javascript, perl, python, r, ruby, scala, stan and xml
Added print sub-option to toc_float to control whether the table of contents appears when user prints out the HTML page.
Added readme option to html_vignette which automatically creates a package level README.md (for GitHub) in addition to rendering the vignette.
Support for keep_md in html_vignette format.
Try to install the latexmk package automatically on Windows if the executable latexmk.exe exists.

rmarkdown 0.9.6

Ability to set opts_hooks in knitr_options() (#672)
Added render_site and related functions for rendering collections of documents within a directory as a website.
Ability to define html_document navigation bar using simple yaml format.
Added pre_knit and post_knit hooks for output formats.
Discover LaTeX dependencies and add them to the .tex preamble (#647)
Added new all_output_formats function to enumerate all output formats registered for an Rmd.
Change fig_caption default to TRUE for all formats
Change fig_retina to 2 for HTML formats (no longer contingent on fig_caption)
Ensure pandoc binary exists before binding to pandoc directory (#632)
Handle relative paths for 'default_output_format' (#638)
Eliminate duplicate viewport meta tag from html_document
Added biblatex biblio-style support to the LaTeX template for Pandoc 1.15.2 (#643)
Allow override of header font-size in html_document custom css (#652)
Fix for horizontal scrollbars appearing w/ code folding (#654)
Specifying toc_float in html_document now automatically sets toc = TRUE
Enable per-header opt-out of toc-float via {.toc-ignore} attribute
Correctly handle soft line breaks in ioslides_presentation (#661)
Don't use text-muted for code folding btns (text visibility in non-default themes)
Fix for rendering non-HTML formats from .md files (resolve runtime before knit)
html_dependency_bootstrap now accepts theme = "default" argument
Use pandoc 1.17.0.2 compatible LaTeX template when pandoc >= 1.17.0.2
Support custom template for ioslides_presentation
Added analytics option for ioslides_presentation for Google Analytics
Removed the extra tag <p></p> around HTML output (typically generated by htmltools) from code chunks, to avoid invalid HTML like <p><div>...</div><p> (#685)

rmarkdown 0.9.5

Added odt_document format for OpenDocument Text output
Added rtf_document format for Rich Text Format output
Added github_document format for GitHub Flavored Markdown output
Only apply white background for themed HTML documents (#588)
Added to the default HTML template to make it work better with mobile browsers. (#589)
Specify --filter pandoc-citeproc after custom pandoc args
Long lines in code blocks will be wrapped in the html_vignette() output (#595)
Added new arguments run_pandoc = TRUE and knit_meta = NULL to render(). See the help page of render for details. (#594)
The tufte_handout format now delegates to the tufte package and no longer provides a base template.
Use pandoc 1.15.2 compatible LaTeX template when pandoc >= 1.15.2
Fix issue with Beamer template and pandoc 1.15.2
Updated embedded JQuery to v1.11.3 and Bootstrap to v3.3.5.
Expose core HTML dependencies for use by custom R Markdown formats.
New html_document themes: "lumen", "paper", "sandstone", "simplex", & "yeti".
Ability to include bootstrap navbar for multi-page html_document websites
Added support for abstract field to html_document format
Added support for floating table of contents (via tocify) to html_document
Added support for tabsets via use of {.tabset} class on top-level headings
Added support for folding/unfolding of R code chunks in html_document
Support url references in CSS files for runtime: shiny
Change name of common options file to _output.yml
Tweak pandoc conversion used in pandoc_self_contained_html to prevent hanging with large script elements (use "markdown" rather than "markdown-strict" as input format)
The filename extension .bib will be removed before bibliography files are passed to Pandoc when the output is LaTeX/PDF and the citation package natbib or biblatex is used on Windows. This is because bibtex in MikTeX will always add the extension .bib to bibliography files, e.g. it treats foo.bib as foo.bib.bib. (#623)
Render Shiny documents in a clean environment; fixes issue in which code in Shiny documents could access internal R Markdown state

rmarkdown 0.9.2

Added a fix to #580 for Windows users.

rmarkdown 0.9.1

Fix for a bug causing certain files to be deleted as intermediate files. (#580)
PDF/LaTeX output no longer uses natbib as the citation package by default. If you do want to use natbib or biblatex, you may still use the argument citation_package = 'natbib' or 'biblatex'. (#577)

rmarkdown 0.9

Fix for JS exception in slidy_presentation when served from the filesystem (don't call pushState for file:// urls)
Escape single quotes in file paths
Fix for missing resources when rendering a filename with shell characters
For PDF/LaTeX output, citations are processed via natbib or biblatex instead of pandoc-citeproc. The ciation package natbib or biblatex can be chosen using the argument citation_package in pdf_document(), beamer_presentation(), and tufte_handout(). LaTeX is compiled to PDF via latexmk (https://www.ctan.org/pkg/latexmk/); if it is not installed, a simple emulation will be used (run pdflatex/xelatex/lualatex, bibtex, and makeindex a few times). You are recommended to install latexmk, and please note latexmk requires a Perl installation (this is important especially for Windows users).
Always use the graphics package for PDF output
Fix for the error "cannot change value of locked binding for 'metadata'" when one call of rmarkdown::render() is nested in another one (#248)
Fix for an issue causing image paths to be rendered incorrectly in Windows when rendering an html_document with self_contained: false and a path is passed in argument output_dir. (#551)
Add always_allow_html option for preventing errors when html_dependencies are rendered in non-HTML formats (e.g. pdf_document or word_document).
Fix for an issue causing resources not to be discovered in some documents containing an empty quoted string ("") in an R chunk.

rmarkdown 0.8.1

Support for table of contents in word_document (requires pandoc >= 1.14)
Support for opts_template in knitr options
Don't implicitly discover directories when scanning for dependent resources
Fix for slide numbers not showing up in ioslides when served from the filesystem (don't call pushState for file:// urls)
Remove inlining of bootstrap CSS (was workaround for bug now fixed in pandoc)
Allow specifying an R file in calls to find_all_resources

rmarkdown 0.8

Add support for keep_md to word_document
Increase pandoc stack size to 512M (often required for base64 encoding e.g. larger embedded leaflet maps). Stack size can also be controlled by the pandoc.stack.size option.
Allow YAML front matter to be terminated with ...
Automatically generate a user-interface (via a Shiny application) for user specification of values in parameterized reports.
Add tightlist macro for compatibility with pandoc >= 1.14
Bugfix: Don't merge render params recursively with knit_params
Bugfix: Handle slashes correctly on Windows for slidy_presentation when self_contained = FALSE

rmarkdown 0.7

Add latex_engine option to beamer_presentation format
Ensure that when LANG=en_US pandoc receives en_US.UTF-8 (prevent hang)
Generate MathJax compatible output when using html_fragment format.
Use pandoc built-in template for Beamer
Use pandoc 1.14 compatible LaTeX template when pandoc >= 1.14
Inline bootstrap.min.css to workaround pandoc 1.14 base64 encoding issue
Add support for discovering references to external resources when the document output format is PDF
Fix several issues causing pandoc errors when an intermediates directory is used, including during render for Shiny documents

rmarkdown 0.6

Support for parameterized reports. Parameter names and default values are defined in YAML and can be specified via the 'params' argument to the render function
'md_extensions' option to enable/disable markdown extensions for input files
Automatically discover and include dependent resources (e.g. images, css, etc.) for interactive documents.
Added pandoc_version function.
Use VignetteEncoding directive in html_vignette format
Fix issues related to use of non-ASCII characters in ioslides_presentation
Non-ASCII characters in the YAML data are not marked with the UTF-8 encoding when they are read into R, so character strings in rmarkdown::metadata may be displayed incorrectly (#420)
Various improvements to tufte_handout format

rmarkdown 0.5.1

Add 'dev' option to output formats to specify output device for figures
Enable use of footnotes in titles of LaTeX documents
Various improvements related to directory detection/handling on Windows

rmarkdown 0.4.2

Sync to the latest LaTeX and Beamer templates from pandoc-templates
Switched from the Bootstrap 2 web framework to Bootstrap 3. This is designed to work with Shiny >= 0.10.3, which has made the same switch
Add CSS to restore responsive image behavior from Bootstrap 2
Use a more subtle treatment for inline code in Bootstrap themed documents
Improved support for multiple authors in ioslides
Workaround for poor rendering of ioslides multi-columns lists in Safari 8
Serve index.html as fallback default file for rmarkdown::run

rmarkdown 0.3.11

Initial release to CRAN

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NEWS.md

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