Apple rolled their own, non-standard Push workalike at <a href="https:&#x2F;&#x2F;developer.apple.com&#x2F;notifications&#x2F;safari-push-notifications&#x2F;" rel="nofollow">https:&#x2F;&#x2F;developer.apple.com&#x2F;notifications&#x2F;safari-push-notifi...</a> which is available to members of the $99&#x2F;yr Mac Developer Program.