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

As WebKit / Safari is landing [scoped Custom Elements](https://github.com/WICG/webcomponents/blob/gh-pages/proposals/Scoped-Custom-Element-Registries.md) we should be careful with polyfills or observing custom elements in there because the inner registry might already know, or take care of, those elements ... so that `<shoe-thing>` in there might not need to be bootstrapped, when in ShadowRoot, like the `<shoe-thing>` on the main light-dom, actually this is a very risky thing to do for whoever is dealing with patched `attachShadow` too, if that logic assumes all those potential custom elements require outer main DOM intervention.

-- 
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/issues/1287#issuecomment-2490383602
You are receiving this because you are subscribed to this thread.

Message ID: <whatwg/dom/issues/1287/2490383602@github.com>