I think this may depend on the browser, but I can't test cause I can't find the setting in Display Settings ... ?

edit

Or is it just a CSS hack?

update

OK found it hidden in the help page...

• Code Prefix: whatever you enter here will be used as a prefix for lines inside <code> blocks. If you specify something that matches /&\d+;/, then those digits will be incremented for each line of code. Typically you would specify &001;: to have all code lines numbered starting from 001.

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