T200687: Consider how MCR and TemplateStyles will interact

Phabricator Link	T200687
Status	open
Priority	needs triage (violet)
Author	[1]
Owner
Projects	Multi-Content-Revisions (Watching) TemplateStyles (External)
Subtasks	T187935: Allow cross-slot access during HTML rendering.
Parent Tasks	T189220: Ensure that relevant extensions are MCR-aware
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