I use PWAs on my work (Windows 10) and personal (Linux) devices.
I also sometimes "create" these Web Apps using more tools > create shortcut > open in new window
and then from chrome://apps
right click and create a shortcut in the application menu.
These shortcuts can then be "pinned to dock" (Win10) or "added to favorites" (Linux/Gnome).
Some of the icons have a background that should be transparent instead of black. This is easy to fix.
Where can I find these PWAs on my local devices?
Windows 10/8/7: C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Web Applications\
macOS: ~/Library/Application Support/Google/Chrome/Default/Web Applications
Linux: ~/.config/google-chrome/Default/Web Applications
Linux (Chromium): ~/.config/chromium/Default/Web Applications
Chrome OS: /home/chronos/Web Applications