Where does this window shape come from?

Question

Software and Internet Services

Good afternoon!
I need to repeat the appearance of this window (attached a photo).
Please tell me where is it from?
Year, version, browser... Anything will be useful.
If you provide, the source where such styles will be provided will be generally gorgeous)
Thanks in advance!

Answer 1

This window form is called HTTP Authentication.
https://php.ru/manual/features.http-auth.html
And the style of the window is determined by the operating system and browser.
I have never used a macos, but I see from the design of the window that it is either XP with IE, or judging by the buttons, but on XP such a design could also be set with round window buttons.