var requestId = 'getUUID-' + Date.now(); var iframe = this.document.createElement('iframe'); iframe.style.display = 'none'; iframe.src = 'https://core.airbridge.io/webuuid/iframe.html?requestID=' + requestId; window.addEventListener('message', function replyHandler(event) { window.removeEventListener('message', replyHandler); document.body.removeChild(iframe); console.log(event.data['reply']['uuid']); }); this.document.body.