Re: [ServiceWorker] Prefetch/prerender & Client id (#210)

@annevk they're not. prefetch fetches the resource but it wouldn't "execute" it - i.e. for HTML file it wouldn't trigger fetches for any subresources declared within it. Same applies to preload, the only difference being: preload is used to fetch resources for current nav context (i.e. high priority), whereas prefetch is used to fetch resources for next (likely) navigation context. Hope that makes sense.

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