Let's not put logo URL in an inline background-image style, these can be cached forever and thus are very annoying to change. It should be trivial to make a ResourceLoader module that would just output '#p-logo a { background-image: url($wgLogo); }'.
(This affects Vector and Monobook skins.)
Version: 1.23.0
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=30113
https://bugzilla.wikimedia.org/show_bug.cgi?id=71334