Re: [w3c/webcomponents] HTML Modules (#645)

> This does pretty much everything HTML imports did, and more, since it supports modules. It's also implemented entirely in JavaScript. I think this is evidence that there does not need to be a specification for this. As per the extensible web manifesto, it's better to spec low-level stuff and leave the high-level features to libraries, exactly as done here.

However, doesn't this mean that it is held in memory multiple times instead of only once (in the DOM) as HTML Modules would have been, thus increasing parsing, execution, and allocation costs?

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