Service Workers are now under active development in MS Edge. You can track progress at https://developer.microsoft.com/en-us/microsoft-edge/platform/status/serviceworkerAnonymous commented
Thanks for prioritizing this for Edge. Does this mean it will also be implemented for the Universal Windows Platform?
4,232 votes436 comments · Universal Windows Platform » Device - Phone / Mobile · Flag idea as inappropriate… · Admin →
Currently, the platform provides a number of SMS Access from a system eventing perspective (as of Windows Phone 8.1), and Windows Phone supports sms backup/restore for consumers as part of the base OS (Settings → Backup). What we don’t provide is a backup API.
Using SMS events: Check out the Build 2014 session (http://channel9.msdn.com/Events/Build/2014/2-518) or MSDN docs on background tasks (http://msdn.microsoft.com/en-us/library/windowsphone/develop/hh977056.aspx)
Although the capabilities are there from a consumer perspective (the core ask for the suggestion), I’m marking this as ‘Under Review’ for the API perspective. The team is aware of the ask and it is something that is being considered.