Plain article is not supported. This is due to the fact that the Twitter embeds differ a bit in structure, but are nevertheless implementable in IV (please review my implementation).

It seems that quite a large number of articles have embedded tweets, not rendering these pages in IV would be a shame.

There is nothing special with this page, it's a plain article that can be rendered in IV just fine (please verify my implementation).

The cover is missing from an article that has a cover on the source website.