New option in gitbook's font settings menu to control line spacing (thanks, @hayden-MB, #1479).

New configuration setting include_md to control whether the input search includes .md source files in addition to .Rmd (thanks, @katrinabrock #1483, @kylelundstedt #956).

New mathjax-config option for bs4_book and gitbook to control MathJax config string (thanks, @bwu62, #1472). The option can be set either in the YAML metadata or as a variable in pandoc_args. Currently tested and supported settings:

• If empty, defaults to original TeX-MML-AM_CHTML which renders all equations in common HTML.
• If set to TeX-AMS-MML_HTMLorMML renders equations in HTML + CSS (which may look nicer for some equations).
• If set to TeX-MML-AM_SVG renders equations in SVG.

Fixed the bug that render_book() fails due to file.rename() being unable to rename files across different disk volumes (thanks, @Giqles @katrinabrock, #804).

Custom config files passed to the config_file argument of render_book() are no longer temporarily renamed to _bookdown.yml (thanks, @debruine, #1307).

Do not move all _files directories temporarily to the _bookdown_files directory when calling render_book() (thanks, @steeleb, #1307).

Fix an issue with parsing resources from raw HTML code (thanks, @lennylin, https://community.rstudio.com/t/bookdown-image-with-a-weblink/172542)

R 4.3.x would error if multiple files are passed to render_book() without an output_format specified (thanks, @slodge-work, #1442).

Fix an issue with CSL using hanging indent style in gitbook() (thanks, @pablobernabeu, #1422).

Fix cross referencing of figures and tables in epub_book() format by correctly adding an anchor id at the caption level (thanks, @muschellij2, #766, @tstratopoulos, @jasonmosborne, #1399, @N0rbert, rstudio/bookdown-demo#42).

Adapt an epub_book() internal command-line argument passed to Pandoc for changes from version 3.0 and above (#1425).

Fix an issue with Pandoc 2.19 not rendering math by default in epub3 format (#1417).