window.onbeforeunload not working on the iPad?

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This bit of JavaScript works for me on Safari and Chrome on ipad and iphone, as well as desktop/laptop/other browsers:

var isOnIOS = navigator.userAgent.match(/iPad/i)|| navigator.userAgent.match(/iPhone/i);
var eventName = isOnIOS ? "pagehide" : "beforeunload";

window.addEventListener(eventName, function (event) { 
    window.event.cancelBubble = true; // Don't know if this works on iOS but it might!
    ...
} );

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