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<!DOCTYPE HTML>
<html>
<head>
<style>
#target5 {
position: absolute;
top: 0px;
left: 0px;
width: 20px;
height: 20px;
background: #f00;
}
</style>
<body>
<div id="target5"></div>
<script>
var io = new IntersectionObserver(function (records) {
window.parent.postMessage(records[0].rootBounds == null, 'http://mochi.test:8888');
}, {});
io.observe(document.getElementById("target5"));
</script>
</body>
</html>
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