[<][<=][=>]GFM extensions to CommonMark

GFM extensions to CommonMark
    Tables
    Checklists
    Strikethrought
    Autolinks
    Disable HTML tags
    Footnotes (no GFM standard)
    Syntax highlighting
    YAML Metadata (unsupported)
    Emojis (unsupported)
    generated footnotes:

[<][<=][=>][*]

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Autolinks

www.commonmark.org

Visit www.commonmark.org/a.b.

www.google.com/search?q=Markup+(business)

www.google.com/search?q=Markup+(business)))

(www.google.com/search?q=Markup+(business))

(www.google.com/search?q=Markup+(business)

http://commonmark.org

(Visit https://encrypted.google.com/search?q=Markup+(business))

Anonymous FTP is available at ftp://foo.bar.baz.

foo@bar.baz

a.b-c_d@a.b

a.b-c_d@a.b.

Don't work: a.b-c_d@a.b-

Don't work: a.b-c_d@a.b_