Re: [w3c/webcomponents] CSS Modules (#759)

> there will be performance and memory gains in sharing it

Note that at least Gecko already coalesces multiple loads of the same stylesheet into doing a single load+parse, and has a single copy-on-write data structure with all the actual information backing multiple very small CSSStyleSheet  objects.  So the gains here would be much smaller than one would think.

@matthewp I'd like to understand the issue you raise about dependencies better.  What are people trying to do that the current `@import` syntax/semantics do not allow but option 3 would allow?

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