HTML5 vs Markdown: What are the differences?
HTML5: 5th major revision of the core language of the World Wide Web. HTML5 is a core technology markup language of the Internet used for structuring and presenting content for the World Wide Web. As of October 2014 this is the final and complete fifth revision of the HTML standard of the World Wide Web Consortium (W3C). The previous version, HTML 4, was standardised in 1997; Markdown: Text-to-HTML conversion tool/syntax for web writers, by John Gruber. Markdown is two things: (1) a plain text formatting syntax; and (2) a software tool, written in Perl, that converts the plain text formatting to HTML.
HTML5 and Markdown can be primarily classified as "Languages" tools.
"New doctype", "Local storage" and "Canvas" are the key factors why developers consider HTML5; whereas "Easy formatting", "Widely adopted" and "Intuitive" are the primary reasons why Markdown is favored.
According to the StackShare community, HTML5 has a broader approval, being mentioned in 3166 company stacks & 3482 developers stacks; compared to Markdown, which is listed in 756 company stacks and 718 developer stacks.