Some markdown editors (like stackedit.io) support a [TOC] “command”, which will insert/show a Table Of Contents, based on the headlines of the current document.
It would be good, if the markdown engine used by Gitlab for on-premise installations would support [TOC] as well. Both for Wikis and also for normal “in-code” .md markdown files. Especially for lengthy documents, so that people quickly can see, what’s documented there.
I found https://gitlab.com/gitlab-org/gitlab-ce/issues/2494 and saw, that [[_TOC_]] is supported.
It works - great! 
Nonetheless, it would be great, if [TOC] could be supported as well, to be compatible with Stackedit and others, who use this tag.
small remark / addition.
This seems not to work for Markdown files in the repository (for example readme.md).
My assumption is that this is a wiki specific feature of Markdown in Gitlab.
This seems not to work for Markdown files in the repository (for example readme.md).
The related issue is here: Support for TOC in README files (#45388) · Issues · GitLab.org / GitLab FOSS · GitLab
It looks like it depends on the CommonMark migration.
Just for the record I do see that ToC in .md is supported with recently version maybe after https://gitlab.com/gitlab-org/gitlab/-/issues/21901 was resolved.
Sorry what is the status for Readme.md?
I can see TOC menu auto-generated while opening the file separately but not when viewing the whole Project page.
Github has that menu in place.
Thank you 130s.
It’s work.