2026-08-28 · 5 min read · Rahul Chitturi
- markdown
- documentation
- debugging
Documentation often needs to show Markdown that itself contains fenced code. If the outer and inner examples use the same run of backticks, the renderer may close the outer block early and interpret the remaining sample as live headings, links, or HTML.
The source can look balanced in a text editor while GitHub, a documentation generator, and a PDF exporter produce different layouts because their Markdown dialects and extensions differ.
Choose a delimiter that cannot collide
Make the outer fence longer than any matching delimiter inside the example, or use tilde fences outside when the target dialect supports them. Keep opening and closing fences consistent and place them on their own lines.
- Count the longest run of backticks inside the sample
- Use at least one more backtick for the outer fence
- Check whether surrounding list indentation changes block parsing
- Add a language label only when it describes the fenced content
Preview every publishing target
CommonMark and GitHub Flavored Markdown define useful baselines, but static-site plugins may add highlighting, directives, or sanitization. Preview with the actual renderer before changing content to satisfy a different tool.
PDF conversion adds pagination and width constraints. Long code lines may overflow even when the fence itself parses correctly, so inspect both structure and final layout.
A Flashman workflow
Draft with the Markdown editor, inspect a clean rendering in the viewer, export a PDF for the final artifact, and use the diff tool to confirm a delimiter fix did not alter the sample.
Keep one regression document with nested fences, lists, inline backticks, and HTML-looking text. It provides a quick compatibility check when the renderer or export pipeline changes.