@JMinor https://github.com/wikimedia/wikipedia-ios/pull/1595 added but please don't merge it to develop, it should be tested on iPad and need additional actions to develop like 'close' buttons, different video quality selection, errors processing, it supports .ogv files only (I just parse html images for .ogv files only).

PoC of using brion's OGVKit in wikipedia iOS

User has two preferred English languages (US and UK for example). osLanguages are [en,de,tr,en] for him and will be translated to [de,tr,en] because first EN already exists in suggested languages list and will not be added to the list of languages again. I thought that it is not an issue (who uses two English?) but app uses first language from list as primary language, so user will have Turkish as primary language instead of English according to preferred languages from iOS Settings.

You pass HTML to NSAttributedString and iOS has strange behaviour when trying to render numbers and ordinary letters using by system font.
Ordinary letters will be rendered successfully but number's rendering will be failed for standard Apple system font, SF as I know.
This simple text with superscript will be rendered differently for -apple-system and Helvetica.
It's related to NSAttributedString only, not WKWebKit.

I have changed styles for references according to articles styles