Зачем

$(function () {
  $(window).bind('popstate', function () {alert('pop');});

  window.history.pushState(null, '', '/foo');
});

не предупреждаетpop ?

Примечание: тестирование на последнем Chrome

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В соответствии сMDN:

A popstate event is dispatched to the window every time the active history entry changes. If the history entry being activated was created by a call to pushState or affected by a call to replaceState, the popstate event's state property contains a copy of the history entry's state object.

Так почему мойpushState не вызываетpopstate событие?