Example code
<script>
function onMessage(event) {
if (event.data && event.data.riddleEvent) {
var riddleData = event.data.riddleEvent;
if ('object' === typeof (riddleData)) {
if (riddleData.action === 'view-quiz-result') {
// Your core here
}
}
}
}
window.addEventListener("message", onMessage, true);
</script>