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

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. Pandoc also supports markdown_strict. Here the only extension enabled by default is raw_html.

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)}