Chrome window types. What do they stand for?

Question

chrome.windows API tells about 5 window types: "normal", "popup", "panel", "app", "shell".

• Normal windows are standard windows with tabs;
• Popup windows are 1) standalone windows with apps (this feature is currently available on Windows and Linux), 2) chrome devtools if its window is open separately;

But what are the other 3 window types? Official API provides very little information about this

Answer 1

• App used to be the application mode window (ran with --app=http://...) and is now replaced by popup type. Based on this and this.

• Shell I have my money on native system dialogs (Print using Ctrl+Shift+P) but can't really tell for sure.

• Panel are some snappy, buggy, always-on-top windows that dock near the tray area. You need to enable those with --enable-panels flag and they look like this on Windows:

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