Sorry, I didn't follow that. What do you mean by "it throws"?

I'm wondering if calling `parent.moveBefore(customEl, sibling)` will invoke customEl's disconnected and connected callbacks.

> If this is part of the spec, why can Safari just not do it?

Customized Built-In Elements (is=) are a remnant from Web Component days when Google threw (lots of) tech against the wall (to see what stuck).

Apple always stated they won't implement CBE in Safari.

github.com/WICG/webcomp...

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