How can I highlight deleted and added lines like in this comment? How do I make it look like a git diff?

Do I have to use HTML? Or is there some tricky syntax like strikethrough?

1 Answer 1


That is done by using a code block with the "diff" syntax. The raw markdown would look something like this:

One small step for 

I've made a gist also that demonstrates the code (click "Raw" to view the markdown).

  • Thanks! Not knowing this had been bugging me for a long time. Out of curiosity, where is this documented? I couldn't find it anywhere.
    – Ashitaka
    Commented May 29, 2014 at 13:43
  • 1
    You can see the complete list of languages they do syntax highlighting for here: github.com/github/linguist/blob/master/lib/linguist/… It is so long, diff was bound to be there!
    – John C
    Commented May 30, 2014 at 13:26

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