Re: [w3ctag/design-reviews] Periodic Background Sync (#367)

Thanks!

We've exposed a periodic-background-sync permission through the Permissions API. Using that permission may show a permission request to the user, depending on the browser implementation.  The feature must only be available on secure origins, and may be further restricted to installed web apps only, based on the browser implementation.
The frequency of the periodic task is decided by the browser, and the browser may base that on the user's engagement with the site.

Notifications are suppressed by the OS in DND mode, and so we don't feel that the Periodic Background Sync spec needs to define any special treatment of DND. Please let us know if you disagree.

Regarding changing behavior on metered connections and in power save mode, we're of the opinion that this should be by way of guidance, rather than a requirement.
Implementations should be conservative about data usage on metered networks, and should respect the device's battery saving mode, if it has one. The browser implementation is better positioned to make these decisions, based on the unique requirements of the user. For instance, data plans are becoming cheap in India and not everyone has access to wifi. So disabling the feature on mobile networks might not be the right decision for that demographic.

I'm happy to include words to that effect in the explainer. I'll update it soon. :)

Thanks for the feedback!

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