Re: [w3c/webcomponents] connectedCallback timing when the document parser creates custom elements (#551)

> How does the current document-register-element polyfill work in this regard?

with anything that makes sense, without granting any specific behavior since no browser is behaving the same of others.

The sad story short is that Custom Elements are a mess to setup unless you use shadow DOM which works in the constructor too, but shadow DOM cannot be reliably poly filled and whatever poly around weights already too much and is full of hidden caveats.

... but somebody still wonders how come WebComponents didn't take off as expected 🤷‍♂️

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