The dialog element is now on the backlog with a priority of medium. You can track status changes at https://dev.modern.ie/platform/status/dialogelementformodals/Rodrigo Galter commented
Enquanto o Edge não virar um app independente na loja não vai evoluir, só lamento.Rodrigo Galter commented
Push API is enabled by default in Edge included in Windows 10 Insider Preview Build 17063.
Service Worker was turned on by default in Edge included in Windows 10 Insider Preview Build 17063.
The W3C Web Application Manifest is now under development: https://developer.microsoft.com/en-us/microsoft-edge/platform/status/webapplicationmanifest