[<][<=][=>]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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YAML Metadata (unsupported)

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title: README
author: Zhiming Wang
date: January 8, 2016
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