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Markdown is a lightweight markup language with plain text formatting syntax designed so that it can be converted to HTML and many other formats using a tool by the same name.〔(【引用サイトリンク】title=Markdown )〕〔http://johnmacfarlane.net/pandoc/index.html〕 Markdown is often used to format readme files, for writing messages in online discussion forums, and to create rich text using a plain text editor. ==History== John Gruber created the Markdown language in 2004, with significant collaboration with Aaron Swartz on the syntax,〔〔 with the goal of enabling people "to write using an easy-to-read, easy-to-write plain text format, and optionally convert it to structurally valid XHTML (or HTML)”.〔Markdown 1.0.1 readme source code (【引用サイトリンク】title=Daring Fireball – Markdown )〕 The key design goal is ''readability'' – that the language be readable as-is, without looking like it has been marked up with tags or formatting instructions,〔Markdown Syntax (【引用サイトリンク】title=Daring Fireball – Markdown – Syntax )〕 unlike text formatted with a markup language, such as Rich Text Format (RTF) or HTML, which have obvious tags and formatting instructions. To this end, its main inspiration is the existing conventions for marking up plain text in email, though it also draws from earlier markup languages, notably setext, atx (by Aaron Swartz), Textile, reStructuredText, Grutatext, and EtText.〔 Gruber wrote a Perl script, ''Markdown.pl'', which converts marked-up text input to valid, well-formed XHTML or HTML and replaces left-pointing angle brackets ('<') and ampersands with their corresponding character entity references. It can be used as a standalone script, as a plugin for Blosxom or Movable Type, or as a text filter for BBEdit.〔 Markdown has since been re-implemented by others as a Perl module available on CPAN (Text::Markdown), and in a variety of other programming languages. It is distributed under a BSD-style license and is included with, or available as a plugin for, several content-management systems.〔〔(【引用サイトリンク】 accessdate = 2009-08-11 )〕〔(【引用サイトリンク】 accessdate = 2009-08-11 )〕 Sites such as GitHub, reddit, Diaspora, Stack Exchange, OpenStreetMap, and SourceForge use variants of Markdown to facilitate discussion between users.〔(【引用サイトリンク】url=https://help.github.com/articles/github-flavored-markdown )〕〔(【引用サイトリンク】url=http://www.reddit.com/r/reddit.com/comments/6ewgt/reddit_markdown_primer_or_how_do_you_do_all_that/ )〕〔(【引用サイトリンク】url=http://stackoverflow.com/editing-help )〕〔(【引用サイトリンク】url=http://sourceforge.net/p/forge/documentation/markdown_syntax/ )〕 A Markdown dialect is also used by the instant messaging system Slack.〔https://api.slack.com/docs/formatting〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「markdown」の詳細全文を読む スポンサード リンク
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