How to Update / Change URL when Popup Modal Loads?

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If you are using bootstrap modal so below code is working :

$('#myModal').on('loaded.bs.modal', function (e) {
  if (typeof (history.pushState) != "undefined") {
        var obj = { Title: "About Us", Url: 'about?utm_form=popup' };
        history.pushState(obj, obj.Title, obj.Url);
    }
})