Cross-tab communication
Proxy303 (7)

This is a simple program used to demonstrate how to get one tab to communicate with another. Click the button on either tab to make an alert on the other.

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Proxy303 (7)

I already that you can open a page as a variable, like this:
var x = window.open()
And edit it like this:
x.document.write()

But I found out that you can do things like:
x.document.getElementById().addEventListener()
and
x.window.alert()