Template:OptionalLink
From Self-sufficiency
Template takes two arguments, the first is an optional article to link to, the second is text.
Examples
| xxx[[|yyy]]zzz | xxxyyyzzz |
| xxx{{OptionalLink||yyy}}zzz | xxxyyyzzz |
| xxx{{OptionalLink|Hydrogen|yyy}}zzz | xxxTemplate:InternalLinkzzz |
