Skin:Vector/Customizing the logo for special events

It is possible to customize the logo for special events. In classic Vector and the currently in progress refresh of Vector the mechanisms are different.

In Vector classic the logo is provided purely by CSS and thus a CSS only change can substitute the logo for another. See Category:Wikipedia_commemorative_logos

In the Vector modern version the logo cannot be substituted but can be decorated using CSS pseudo elements as in the examples in this page.

Example 1 - Wikipedia logo with a party hat
Code: