It is based on simpleMDE - A JS editor that utilizes Marked to render Markdown previews same as Github flavored Markdown(GFM)1
https://github.com/Ionaru/easy-markdown-editor
https://github.com/sparksuite/simplemde-markdown-editor
Due to simpleMDE becomes inactive in 2017, this one forks out with a bit enhancement. All APIs remains the same
CodeMirror as the the core editor which handles the code->view framework, which also comes with API to further customized your editor behavior & feature
https://codemirror.net/doc/manual.html
https://github.com/codemirror/codemirror
Footnotes
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An extended MarkDown SPEC based on CommonMark. Extended features including: autolink, task-list, GFM line-breaks, emoji and more... ↩