End result currently:

#ca-wikilove.icon a {

background-image: url(data:image/png;base64,…kJggg==);
background-image: url(images/heart-icons-red.png?2014-02-13T17:51:40Z)!ie;

background-image: -webkit-linear-gradient(transparent,transparent),url(images/heart-icons-red.svg?2014-02-13T17:51:40Z);

background-image: linear-gradient(transparent,transparent),url(data:image/svg+xml;base64,…Zz4NCg==);
background-image: linear-gradient(transparent,transparent),url(images/heart-icons-red.svg?2014-02-13T17:51:40Z)!ie;
}

Aside from being inconsistent (fallback png is embedded, fallback webkit gradient/svg is not embedded, primary gradient/svg is embedded), it should only embed one of them (the primary one, in this case gradient/svg).

Look at '#ca-watch.icon a {' in MediaWiki for an example:

#ca-watch.icon a {

background-image: url(images/watch-icon.png?2014-02-13T17:46:40Z);

background-image: -webkit-linear-gradient(transparent,transparent),url(images/watch-icon.svg?2014-02-14T00:15:00Z);

background-image: linear-gradient(transparent,transparent),url(data:image/svg+xml;base64,…zdmc+Cg==);
background-image: linear-gradient(transparent,transparent),url(images/watch-icon.svg?2014-02-14T00:15:00Z)!ie;

Version: unspecified
Severity: normal