XML elements in Markdown
Some DocBook XML elements are treated in a particular way when publishing to Markdown. This can be because of specific Markdown requirements, or because there is no Markdown equivalent for said elements.
Admonitions
Admonitions (such as Tips or Cautions) with titles, as well as all Notice and Danger admonitions are rendered as regular Markdown blockquotes. Notes, warnins and other admonitions that have an equivalent in Markdown, will be rendered as such.

A regular Note

A Note with a title, output as a regular Markdown blockquote
Info elements
The following info elements are supported in Markdown output:
Note
This applies to info elements at publication level.
abstractcopyrightsubtitletitle
These info elements are output as a Markdown header table.

Ordered lists
Setting the numeration style (such as loweralpha, or lowerroman) does not affect the Markdown output, since they are not supported in Github Flavored Markdown. Instead, the default style defined by the browser is used.
Inline elements and styles
Many inline styles and XML elements do not have logical counterparts in Markdown. They will therefore be rendered as plain text. The list below is not exhaustive, but lists some of the most often used styles and elements for which there is no Markdown equivalent.
Overline (style)
guilabeltagbibliography and sybelements
Tables
There are a few limitations in Markdown concerning tables:
Table footer rows are converted to regular table rows.
Table titles and captions will be placed below the table, unless the table contains cell-spans (merged cells), in which case they will be placed above the table.
Width and alignment information for tables will be discarded.
A table without. header row will automatically get an empty header row in the Markdown output, since Markdown syntax requires a header row.
Video
Embedded video content will be converted to a link to the video URL