When you send an SMS message but your phone doesn't have great signal it will continue to try to send the message in the background, even if you cl...
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Unfortunately, we still don’t have support for the Background Sync API on mobile Safari.
That is true, or indeed in Edge or Firefox. But things are moving along and I think this is one of the best progressive enhancements you can make to an application right now.
At least Firefox and Edge have it in the pipeline :) For WebKit (Safari) it’s a mere feature request for now: bugs.webkit.org/show_bug.cgi?id=18...