… And it will open a new window with given URL. Most modern browsers are configured to open new tabs instead of separate windows.
Popup blocking
Popups exist from really ancient times. The initial idea was to show another content without closing the main window. As of now, there are other ways to do that: JavaScript is able to send requests for server, so popups are rarely used. But sometimes they are still handy.
In the past, evil sites abused popups a lot. A bad page could open tons of popup windows with ads. So now most browsers try to block popups and protect the user.
Most browsers block popups if they are called outside of user-triggered event handlers like onclick.
Read full article from Popups and window methods
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