Quickest way to pass data to a popup window I created using window.open()?

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Due to security restrictions it is super easy only if the parent window and the popup are from the same domain. If that is the case just use this:

// Store the return of the `open` command in a variable
var newWindow = window.open('http://www.mydomain.com');

// Access it using its variable
newWindow.my_special_setting = "Hello World";

In the child (popup) window, you could access that variable like this:

window.my_special_setting

Was there something specific you wanted to do past that?

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