Why does Google Chrome on Mac open window.open as a tab?

Question

JavaScript

When calling a function

window.open('href', '_blank', 'width=400,height=250');

in all (popular) browsers and on all (popular) platforms, a window of the specified dimensions (400x250) opens.
But in Google Chrome under Mac, a new tab opens.
Has anyone encountered a similar problem?
Is this a bug or is there some additional settings?

Answer 1

As it turned out, the problem was using the full-screen mode of the browser on the Mac.