Board Thread:Support Requests - Getting Technical/@comment-5556688-20131211181051/@comment-1330470-20131212052102

Inline styles can NOT be used to set background images. That is,. That's because it's a security risk. Someone could theoretically load a virus as a background image. If you try an inline background-image; Mediawiki nukes ALL inline styles appended to that element.

You can set a class on the image and then use Mediawiki CSS pages to append background images to that class. This is fine, but requires access to Mediawiki pages (an administrator privelege).