window.open behaviour in chrome tabs/windows

Chrome automatically opens a URL in a new tab only if it’s user generated action, limited to one tab per user action. In any other case, the URL will be opened in a new window (which, BTW, is blocked by default on Chrome).
window.open must be called within a callback which is triggered by a user action (e.g. onclick) for the page to open in a new tab instead of a window.

In your example, you attempt to open N tabs upon user action. But only the first one is opened in a new tab (because it’s a user generated action). Following that, any other URL will be opened in a new window.

Similar question: force window.open() to create new tab in chrome (see answer by maclema)

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