Interesting. For a moment it is italic, and then it isn't. I can't quite figure out why, but obviously something to do with the CSS.   As to search, from what I can tell, Mediawiki's autocompletion for desktop uses AJAX to do its job, whereas the Mobile Frontend extension uses an alternative method. Since we no longer use MobileFrontend, for now at least on mobile autocompletion won't work. However, Mediawiki has fairly recently released its own responsive skin, Timeless, and it's likely that they're working on changing search so that it can use a method that mobile devices can use. I'll look more into this. Possibly there's already a modification or beta somewhere that has a mobile-friendly autocompletion.