It would be useful to be able to apply CSS styles to wikilinks according to their destinations.
This could simply be realised by assigning the A tag a HTML class indicating the interwiki prefix, or the namespace identifier, for example "iw-xxx" or "ns-xxx", so that a CSS style can be put in place based on the relevant selector:
a.iw-mw { /* Links to mediawiki.org are orange. */ color: orange; } a.ns-14 { /* Links to categories are green. */ color: green; }