In T198946 we identified a change we'd like to make to add a tag to the top of pages. While the change is simple we're not clear where this code should live.
The spike should involve talking to various people (e.g. component developers) and answer the following questions:
* Is there any existing extension that does this already?
* Should this live in [[ https://www.mediawiki.org/wiki/Extension:GoogleRichCards | the Google Rich Cards extension ]] ?
* Should it live in a Wikibase extension?
** Which one?
* Should it live in MobileFrontend?
* Should it live in core?
* Should it live in its own extension?
** If so does it need security review?