Markdown Highlight
Last updated: 2026-10-14
Highlight Common extension
A Markdown extension. Double equals ==text== renders as yellow <mark> highlight — perfect for marking key points. Supported by marked.js and Pandoc; GitHub does not support it yet.
| Group | GFM Extensions |
|---|---|
| Spec level | Common extension |
| Spec version | CommonMark 0.31.2 + GFM |
📝 Syntax
==highlighted text==▶ Live Example
Edit Markdown on the left, see the result on the right
💡 Key points
⚠️ Warning GitHub shows the equals signs literally — verify the target platform first.
ℹ️ Note It renders <mark>, semantically 'relevant in this context' — machines understand it.
❓ FAQ
Q Does this site support it?
A markdown-it needs the markdown-it-mark plugin, off by default.
Q Highlight vs bold?
A Bold is emphasis semantics; highlight is visual marking — they stack.
Q How to highlight on GitHub?
A Use the HTML <mark> tag instead — GitHub allows it.
📚 See also
BoldCommonMark core StrikethroughGFM extension Inline HTMLCommonMark core