[Javascript] 페이지가 새 탭 또는 새 창으로 열렸는지 확인

Code Snippet

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if (window.history.length === 1) {     // Do something... }

References

https://www.sitepoint.com/community/t/find-out-when-page-is-opened-in-new-window-or-new-tab/8910/11