I saw that people can input code with gray background and include hyperlinks in their answers and comment, for example, the answers from the following link give a good example

How to remove redundant {} from a nested list of lists?

where can I learn how to do that?

  • 3
    In the Your Answer box below click on the ? for help then click on Links. Also see the Markdown help page.
    – Bob Hanlon
    Commented Nov 28, 2016 at 6:10

1 Answer 1


Click the "edit" or "improve this answer" link under the post (whichever you see) and take a look at the Markdown source.

It looks like


There are many of these because they are easy to enter using these tools.

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