Re: [whatwg/dom] [ElementInternals] `ElementInternals.shadowRoot` is `null` but `this.shadowRoot` is not (its a `ShadowRoot`) (Issue #1365)

trusktr left a comment (whatwg/dom#1365)

The solution seems to be that the upgrade process should set the root's `available to element internals` to `true` before running a custom element constructor, as the custom element constructor is the first valid place for a user to use `ElementInternals`.

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