Re: [whatwg/dom] `MutationObserver` flag to observe mutations in (open) shadow trees to facilitate polyfills of HTML syntax (Issue #1287)

LeaVerou left a comment (whatwg/dom#1287)

I edited the OP to remove the previous Option 2 (`globalObserve()`) and to add a new alternative: a `shadowAttached` boolean option. Together with `:has-shadow` ( https://github.com/w3c/csswg-drafts/issues/11007 ), they allow implementing this pattern in userland, is much simpler (only a boolean option is necessary, since existence of closed shadow roots can already be observed), and a lot easier to implement. And even if we later add a `shadowRoots` option, observing shadow root creation is still independently useful.

Happy to prototype a PR if we decide this is a direction worth pursuing (agenda+ed for that)

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