Re: [w3c/webcomponents] Template/part proposals should explain how and why they improve performance (#901)

Yes, the developer marking up the DOM tree with `parts` have to know its structure. But someone else could be doing the cloning and updates.

For example: we can have a template that represent a row inside a `<my-table>` component. The table author can markup this row template with `parts`. The user of this component can just clone this template with parts and updates them. It allows better encapsulation because there's no need to expose a list of clonedReferences.
 

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