Object-fit and object-position are now under active development :)
You can track progress at https://developer.microsoft.com/en-us/microsoft-edge/platform/status/objectfitandobjectposition/
Development is now underway on position: sticky; You can follow progress at https://developer.microsoft.com/en-us/microsoft-edge/platform/status/positionsticky/
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/serviceworkerFilip Chalupa commented
Please is there any status update? How far are we from seeing service workers in at least the insider program? Last message is year old now.
Push API is now in development: https://developer.microsoft.com/en-us/microsoft-edge/platform/status/pushapi
The W3C Web Application Manifest is now under development: https://developer.microsoft.com/en-us/microsoft-edge/platform/status/webapplicationmanifestFilip Chalupa commented
This and other PWA features can save the Windows Mobile platform. Keep the work up. Thanks.