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

As author of all polyfills from v0 to current state, I fully support this proposal. My workaround is not super slow but it requires me patching the global `attachShadow` method on native classes which is a practice I usually avoid at all costs and something I've been advocating against for just about forever ... yet polyfill gotta polyfill, so that if this new proposal *is* the only thing that might need a greedy polyfill around until everyone is onboard, it's definitively worth the effort to me.

On a side note: the closed shadow might still be addressed somehow and I feel like the elephant in the room here is that we don't have a way for Websites authors to decide what is trusted as script that could patch natives, and what isn't ... *CSP* is not a great answer to this disambiguation, but maybe this discussion should be done in other venues.

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