Wikipedia-style deadlinks

[olynch]

Is it possible to highlight wikilinks that point to pages that haven't been created, similar to the way wikipedia does it?

[JonFairbairn]

I'm running 0.12.2.1 It seems to put the class "uri" on internal links to pages that exist. I've attached a diff diff.txt that illustrates how one can take advantage of this to put red dotted lines under nonexistent ones. I tried putting it in custom.css, but it didn't have any effect, so the diff is for screen.css

I don't understand why, can anybody help?