Re: [whatwg/dom] Custom element callback/promise for "connected and parsed" (#662)

frehner left a comment (whatwg/dom#662)

We definitely hit this issue: we do several things on initial render, whether that's manual slot assignment +  a `console.warn()` of improper/invalid children (e.g. `<s-select>` only accepts `<s-option>` / `<s-option-group>`), or whether it's imitating `:has-slotted` manually so we know if there is actual content in a specific slot or not (and changing style depending on that). 

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Received on Thursday, 17 September 2026 20:23:27 UTC