Hello #webcomponents people. Lets say you need to do a <custom-parent><custom-child> typ of thing, how do you actually do that? I am asking because I noticed that the connectedCallback is firing twice, once you move things around in there and I don't know how to fix it.
I am not using shadow dom.
@nachtfunke do you have a minimal repro to better understand what you’re running into?
@nachtfunke In general, if you have work that belongs in `connectedCallback()` then you either need to clean it up in `disconnectedCallback()` (which means it can happen again with no issues), move to the future and use `moveBefore()` https://caniuse.com/mdn-api_element_movebefore (no disconnection), leverage `<slot>`s and shadow DOM (no disconnection), or _know_ that you are going to be wrapping the element in the same tree and gate the `connectedCallback()` work on that knowledge (managed disconnection).
@westbrook @nachtfunke holy shit please make this a blog post — so much great info packed into a tiny toot
@zachleat @nachtfunke I'm not saying this is because I didn't get you anything for your birthday, but I'm also not saying it isn't because of that...
https://blog.westbrookjohnson.com/patterns/i-am-feeling-so-disconnected/
@westbrook Thanks for posting this!
Is this layout intentional?
@westbrook @nachtfunke amazing! What’s the best toot to boost?
@westbrook @zachleat thank you so much - I think I know what my wrongdoing was. I did all my DOM creation in an init() function that called in the connectedCalkback() because I interpreted it as somewhat equivalent to $(document).ready() - as in, waiting to make sure everything is there. I understand that this is not necessary for creating DOM that won’t ever be transformed once it was created.
@nachtfunke @zachleat Nice! Glad to hear you've found a path forward on this. 
One time operations, like non-stateful DOM writing, do go well in `constructor()` (if you're likely to need that DOM whether the element is on the document already or not), or behind a `this.hasWritten` style gate in the `connectedCallback()` (if you want to be lazy and wait to write DOM until the last possible moment).
I hope you'll be able to share, maybe even blog about, what you're up to when it's ready! 