How to run function of parent window when child window closes?

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You can somehow try this:

Spawned window: 

window.onunload = function (e) {
    opener.somefunction(); //or
    opener.document.getElementById('someid').innerHTML = 'update content of parent window';
};

Parent Window:

window.open('Spawn.htm','');
window.somefunction = function(){

}

You should not do this on the parent, otherwise opener.somefunction() will not work,
doing window.somefunction makes somefunction as public:

function somefunction(){

}

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