Board Thread:Support Requests - Designing Your Wiki/@comment-34840675-20180425042434/@comment-9605025-20180425073703

That second infobox appears to have changed now as well; FYI. As Darkanine said, portable infoboxes are styled using CSS stylesheets. Also FYI, that stuff you are seeing in source is not HTML, it is a custom markup used by Wikia. in fact, MediaWiki doesn't actually let you use HTML directly. Instead, it provides certain tags identical to HTML and then just converts them. That is why some HTMl elements won't work.