Re: [whatwg/dom] Declarative Shadow DOM (#831)

> I tend to agree that this is a bit odd, and it's also odd that this behavior is potentially observable by user script (e.g. a `<script>` inside of the `<template>`, which [can mutate the template during parsing](https://codepen.io/nolanlawson-the-selector/pen/NWMjZKd) (bug?), or `MutationObserver`, although that seems [fixed now](https://bugs.chromium.org/p/chromium/issues/detail?id=1315283)).

To me, it makes a lot of sense but recently I have tried registering custom elements from inside of the DSD template tag and it did not work well:

https://bugs.chromium.org/p/chromium/issues/detail?id=1365220

So now when this question was asked I start to wonder if both cases are expected or not and if they are connected.

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