What is Markdown?
Markdown is a lightweight plain-text syntax for adding structure such as headings, emphasis, links, lists, quotes, and code. The source stays readable without special software and can be converted into HTML for display.
Where Markdown is used
Markdown is common in README files, project documentation, issue trackers, static-site generators, knowledge bases, chat applications, and publishing systems. Different applications may support slightly different extensions. Because the source is plain text, it also works well with version control and text-based review workflows.
GitHub-flavored features
This preview supports common Markdown plus GitHub-flavored tables and fenced code blocks. The output shows how a compatible parser interprets the document, but another publishing system may render edge cases differently.
Why the preview is sanitized
Markdown can contain or generate HTML. Before previewing or copying the rendered markup, the page removes dangerous tags, event handlers, and unsafe URL schemes so pasted content cannot run scripts in the tool.