Benefits
- No more native overlay hackery
- Text side slider would cause footer (read more etc) text size to scale (presently the native overlay bits don't resize)
(I have proof of concept for the injection, and also shipped a version long ago that used css for the lead image in a way that cropped properly for face detection)
Note: this wouldn't change anything visually. It would just make everything on the article be rendered via the existing article DOM.
Also we could potentiall leverage the proxy server ease the JS injection.
I attached this as a parent task to the article pinch-zoom ticket.