The pandoc default templates https://github.com/jgm/pandoc/blob/master/data/templates/default.html4 and https://github.com/jgm/pandoc/blob/master/data/templates/default.html5 contain [EDIT: pandoc code refactored] import the following from https://github.com/jgm/pandoc/blob/master/data/templates/styles.html:

  <style>
      code{white-space: pre-wrap;}
      span.smallcaps{font-variant: small-caps;}
      span.underline{text-decoration: underline;}
      div.column{display: inline-block; vertical-align: top; width: 50%;}
      div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
$if(quotes)$
      q { quotes: "“" "”" "‘" "’"; }
$endif$
  </style>

All of these are required to have pandoc html output appear as expected, i.e., as described in https://pandoc.org/MANUAL.html.

None of these instructions appear in rmarkdown/bookdown/blogdown html output, however.

This should be fixed.

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