Microsoft is looking to integrate Progressive Web Apps (PWAs) functionality natively into Windows 10. The company notes that PWAs are not a substitute for full-fledged UWP apps and both can complement each other in the Store bringing benefits to both users and developers.
https://www.notebookcheck.net/Progressive-Web-Apps-to-be-a-native-feature-of-Windows-10-Redstone-4.281678.0.html