As mentioned in [this answer from November 2010](https://meta.stackexchange.com/a/69483/295232):

> For intra-site links (like, SO -> SO) this is now supported.

>     https://meta.stackexchange.com/questions/49424/stack-exchange-sandbox

> becomes*

> https://meta.stackexchange.com/questions/49424/stack-exchange-sandbox

> Like with [tag rewrites][1] this is done on post submission <s>and is not currently reflected in the editor preview</s>. It will always insert the current title into the post, at post creation time. However, should the title subsequently change it will not be updated unless the post is edited.

> <sub>*Note that although the **old** title of the question is in the link, the new one is inserted.</sub>

  [1]: https://meta.stackexchange.com/questions/66965/is-there-some-markup-to-post-tags/69482#69482