Interested in being able to style Shadow DOMs from the main page?
Working with @mia, we added new modes to shadow-boxing.js library which are all about that. These new modes let authors select which specific elements get stylesheets from the outer page moved into their Shadow DOMs.
I've also written brief/linkable examples of usages of the various 'modes'.
https://github.com/bkardell/shadow-boxing/blob/main/README.md#page-push-select-
If you've got thoughts, I'm all ears.