Google Photos Goes PWA - Thurrott.com
"The Google Photos website has been converted to a Progressive Web App (PWA) so that it can be installed on Chromebooks and other PCs.
Today, that means Chromebooks. But if you enable the PWA features hidden in Chrome 67 on Windows or Mac, you can also install Google Photos on those systems"
Google Photos now available as a Progressive Web App
This is What Google Said About PWAs at I/O 2018 - Thurrott.com
Microsoft's Bold Plan to Bring PWAs to Windows 10 - Thurrott.com