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The same Markdown can look different on GitHub, DEV.to, and Notion because Markdown is not one universal rendering engine. Each platform recognizes its own syntax, adds platform-specific features, and may convert content into a different format. GitHub uses GitHub Flavored Markdown (GFM); DEV supports publishing features such as Liquid tags and embeds; Notion imports and exports Markdown through a defined conversion process. The source text may be identical, but the rules applied to it are not.
Three layers explain most differences
A rendering mismatch is not always a matter of fonts or page design. It can happen at three distinct stages:
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- Parsing: The platform decides whether characters form a heading, list, link, table, line break, or extension. Markdown’s original description leaves some parsing details open, which can lead different implementations to interpret edge cases differently. GitHub’s GFM specification discusses this ambiguity.
- Platform processing: A service may recognize special references, tags, or embeds, or process the resulting HTML. GitHub documents post-processing and sanitization; DEV documents Liquid tags and custom embeds.
- Conversion and presentation: A platform may import Markdown into its own content model, export blocks into another format, or apply its own visual styling. A conversion can change content even when the original Markdown was valid.
That is why a formatting difference should not automatically be blamed on a single “wrong” parser. The platforms may be interpreting different syntax, processing it differently, converting it, or simply styling the result differently.
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GitHub uses GitHub Flavored Markdown (GFM), a strict superset of CommonMark. Its formal specification describes extensions including tables, task list items, strikethrough, and autolinks. GitHub.com and GitHub Enterprise also post-process and sanitize the HTML produced from GFM, so the final result is not just a direct display of raw Markdown.
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GitHub also gives certain text platform-specific meaning. For example, its writing and formatting documentation describes @-mentions, issue and pull-request references, and emoji. Those behaviors depend on GitHub and should not be treated as universal Markdown features. A reference that is active on GitHub may not behave the same way when copied elsewhere.
How DEV.to handles Markdown
DEV Community’s Editor Guide describes a Markdown editor that supports front matter, inline HTML in most cases, Liquid tags, and custom embeds. These are useful publishing tools, but Liquid tags and embeds are DEV-specific features rather than portable Markdown syntax. The guide also describes a separate rich-plus-Markdown editor option.
One practical heading difference follows from DEV’s page structure: the post title serves as the page’s H1, so body sections should generally start at H2. If you paste a document whose first body heading is H1, the content may have a different hierarchy from what you intended.
The guide does not identify DEV’s underlying Markdown parser or version, so it is not possible to name its parser or reliably predict every edge case from that documentation alone.
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How Notion handles Markdown imports and exports
Notion treats Markdown as an import and export format, not as a promise that every feature will round-trip unchanged. Its import guidance describes support for standard Markdown, headings, lists, and code blocks, while noting that anchor links and advanced or nonstandard extensions may not import cleanly.
Export can also expose a format mismatch. Notion’s export documentation says callout blocks export as HTML because Markdown has no equivalent. In other words, a Notion page can contain a native block that cannot be represented as ordinary Markdown without changing its form.
This does not mean every anchor or extension always fails in Notion. The documented point is that these constructs may not import cleanly, so check them in the converted page rather than assuming they survived intact.
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Platform differences at a glance
| Destination | Documented behavior | What to watch for |
|---|---|---|
| GitHub | Uses GFM, a strict CommonMark superset, and post-processes and sanitizes rendered HTML. It also recognizes GitHub-specific references and writing features. GFM specification; GitHub Docs. | GFM extensions and GitHub references may not carry the same meaning elsewhere; final output includes GitHub processing. |
| DEV.to | Its editor guide documents front matter, inline HTML, Liquid tags, custom embeds, and a rich-plus-Markdown option. The post title is the page H1. DEV Editor Guide. | Keep Liquid tags and embeds for DEV-specific publishing, and account for the title when structuring headings. |
| Notion | Imports standard Markdown, headings, lists, and code blocks; anchors and advanced or nonstandard extensions may not import cleanly. Callouts export as HTML. Import guidance; Export guidance. | Review converted links and extensions after import; expect blocks without a Markdown equivalent to use another form on export. |
How to make Markdown more portable
- Start with the common core. Use familiar Markdown constructs such as headings, paragraphs, lists, links, images, blockquotes, and fenced code blocks when a document needs to move between platforms.
- Keep platform-only features intentional. Use GitHub references or GFM extensions when publishing to GitHub; use DEV Liquid tags and embeds when publishing on DEV. Do not assume these features will retain their behavior elsewhere.
- Check the destination’s heading structure. In particular, remember that DEV uses the post title as H1, so start ordinary body sections at H2.
- Verify imports and exports. After moving content into Notion, inspect anchors and advanced extensions. If exporting a page with callouts, expect those blocks to be represented as HTML.
- Preview the final destination. A third-party Markdown preview is useful only to the extent that its dialect and processing match the target platform. Inspect the actual editor preview or converted result after the final edit.
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