Can javascript running inside an iframe affect the main page?

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You can do it! Read here for more info

You can affect the document with contains the iframe by setting and getting variables from the window element:

// normally you use...
var whatever = "value";

// use the window object instead, which is shared 
// between the iframe and the parent
window.whatever = "value";

The other thing you should know is that you can access the main document via the parent object

inside the iframe you can use…

parent.someattr;

// or try this
parent.getElementById('some_element');

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