Tabular overview: Pandoc's supported Markdown dialects and extensions enabled by default

Update

As of Pandoc v1.18 (released 26 Oct 2016) and all later releases, the following table isn't all that useful any more. The Pandoc command

 pandoc --list-extensions

will print all available extensions for your current pandoc binary, as well as their enabled (+) or disabled (-) status.

For information about the different sets of extensions enabled in different Markdown dialects consult the manpage; look for the "Markdown variants" part.

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Table (valid for Pandoc v1.15.x)

Extension	markdown (Pandoc)	markdown_phpextra	markdown_github	markdown_mmd	markdown_strict
abbreviations	no	yes	no	no	no
all_symbols_escapable	yes	no	no	yes	no
ascii_identifiers	no	no	yes	no	no
auto_identifiers	yes	no	yes	yes	no
autolink_bare_uris	no	no	yes	no	no
backtick_code_blocks	yes	no	yes	no	no
blank_before_blockquote	yes!	no	no	no	no
blank_before_header	yes!	no	no	no	no
citations	yes	no	no	no	no
compact_definition_lists	no	no	no	no	no
definition_lists	yes	yes	no	yes	no
epub_html_exts (LOOKUP!)	yes	no	no	no	no
escaped_line_breaks	yes	no	no	no	no
example_lists	yes	no	no	no	no
fancy_lists	yes	no	no	no	no
fenced_code_attributes	yes	no	no	no	no
fenced_code_blocks	yes	yes	yes	no	no
footnotes	yes	yes	no	yes	no
grid_tables	yes	no	no	no	no
hard_line_breaks	no	no	yes	no	no
header_attributes	yes	yes	no	no	no
ignore_line_breaks	no	no	no	no	no
implicit_figures	yes	no	no	no	no
implicit_header_references	yes	no	no	yes	no
inline_code_attributes	yes	no	no	no	no
inline_notes	yes	no	no	no	no
intraword_underscores	yes	yes	yes	yes	no
latex_macros	yes	no	no	no	no
line_blocks	yes	no	no	no	no
link_attributes	no	no	no	yes	no
lists_without_preceding_blankline	no	no	yes	no	no
literate_haskell / lhs	yes	no	no	no	no
markdown_attribute	no	yes	no	yes	no
mmd_header_identifiers	no	no	no	yes	no
mmd_title_block	no	no	no	yes	no
multiline_tables	yes	no	no	no	no
native_divs	yes	no	no	no	no
native_spans	yes	no	no	no	no
pandoc_title_block	yes	no	no	no	no
pipe_tables	yes	yes	yes	yes	no
raw_html	yes	yes	yes	yes	yes
raw_tex	yes	no	no	yes	no
shortcut_reference_links	yes	yes	yes	no	yes
simple_tables	yes	no	no	no	no
startnum	yes	no	no	no	no
strikeout	yes	no	yes	no	no
table_caption	yes	no	no	no	no
tex_math_dollars	yes	no	no	no	no
tex_math_double_backslash	no	no	no	yes	no
tex_math_single_backslash	no	no	yes	no	no
yaml_metadata_block	yes	no	no	no	no

Notes:

1. Each extension which is enabled by default can be disabled by attaching the -EXTENSIONNAME to the markdown format specifier.
2. Each extension which is disabled by default can be enabled by attaching the +EXTENSIONNAME to the markdown format specifier.
3. Multiple extensions can be enabled or disabled at the same time, like this: markdown+EXT1-EXT2-EXT3+EXT3.

Examples:

1. Use -t markdown_mmd-pipe_tables+grid_tables if you want to generate Markdown with grid_tables.
2. Another way for same purpose: Use -t markdown-multiline_tables-simple_tables-pipe_tables if you want to generate Markdown with grid_tables.
3. There are more ways…

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_{(Table compiled by evaluating the most recent Pandoc man page for v1.15.0.6)}