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

Indeed. In general the multi-tag designs of HTML (e.g. `<select>` + `<option>`, `<ul>` + `<li>`, `<picture>` + `<source>` + `<img>`, etc.) are very fragile; the amount of spec machinery involved in making them work correctly is extensive and in some cases still buggy in the current spec. (We don't even have a correct design for `<li>` yet, this many years later: https://github.com/whatwg/html/issues/1617.) Web devs should be very cautious when trying to set up such designs for their custom elements; you need to be aware of how children change dynamically, and not just use the children as some kind of setup data.

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