Re: [w3c/webcomponents] Allow customizing base of a shadow root (#581)

@annevk : I don't think implicitly preloading scripts while it's not connected to a document is a good pattern because that can easily lead to unintentional / accidental fetches users of the elements didn't intend.  It's much better to manually `Fetch` or do it when the element is inserted into a document.  For example, `link` element supports `preload` attribute but it doesn't start preloading immediately when the attribute is added; it needs to be inserted into a document.

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