Re: [w3ctag/design-reviews] Background fetch (#279)

>From this post: "The `downloadTotal` property we pass during the background fetch registration is the total number of bytes of the whole set. It’s also optional. If passed, it works as a guard — we’ll get `backgroundfetcherror` event in the service worker if the total size of the resources is larger. Also, it’s a good helper for our UI to show the correct download percentage if needed. Unfortunately, there is another bug: at least on Mac OS this number can’t be larger than `2147483647` (2 GB) which is the maximum size of *one file* in the file system but it’s intended to be the maximum total size of the *whole set*. I’m going to submit a bug to the Chromium Bug Tracker about this. Meanwhile, if the total set size doesn’t bypass 2GB (like in our case) our calculations are correct."

But I might be wrong in my assumptions :)

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