If you have an issue comment / PR description on GitHub, it doesn't automatically get anchors / IDs that you could link to:
What I like to do is to add a visible # character like this:
It renders like this:
Copy/paste-friendly Markdown snippet:
# Some heading <a href="#user-content-some-heading" id="some-heading">#</a>Don't forget to add the user-content- prefix to href – that's how GitHub transforms custom IDs.
Alternatively, if you don't want the visible # character, you could also do this:
It renders like this:
The same URL as before can be used to link to this heading, e.g.:
https://github.com/borekb/example/issues/123#user-content-second-section
(You can use browser dev tools' Inspect element to find out the anchor.)
Just tried this, doesn't seem to work. Do you have a fully functioning live example?