Markdown Code Blocks: Syntax Highlighting, Line Numbers, and Diffing
Use fenced code blocks in Markdown with language identifiers for syntax highlighting. Add line numbers, highlight specific lines, and show diffs.
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Tags: markdown, code, documentation
Markdown Code Blocks: Syntax Highlighting, Line Numbers, and Diffing Code blocks are the most developer-critical part of Markdown. A documentation site with unstyled code blocks looks unfinished; one with syntax highlighting that works correctly for 20 languages looks professional. This guide covers how code fences work in Markdown, how syntax highlighting libraries differ, how to add line numbers, and how to use diff highlighting to show code changes. Inline Code vs. Fenced Blocks Inline code uses single backticks and stays within a paragraph: Fenced blocks are for multi-line code that needs its own visual context: javascript const sum = [1, 2, 3, 4, 5].reduce((acc, n) => acc + n, 0); console.log(sum); // 15…
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