Prevent opening duplicated page in browser

Question

I like to prevent the user from opening my webpage in more then one window/tab.

I tried naming the window with window.name but you end up with two windows with the same name.

PS: I use pure/vanilla Javascript

Answer 1

One option here is to track what pages you (your script) specifically opened and store that in local storage. Since local storage is shared between tabs/windows, you could keep track of open windows. The limitation to this is if that window was opened by other means, it could be a bit problematic.