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<!DOCTYPE html>
<body>
<div id="image"></div>
<script>
const img = document.createElement('IMG');
img.src = 'circles.png';
var observer = new PerformanceObserver(function(list, obj) {
var paintEntries = list.getEntries();
for (let i = 0; i < paintEntries.length; i++) {
// postMessage doesn't allow sending the entry object over directly
var dataToSend = {
"entryType": paintEntries[i]["entryType"],
"name": paintEntries[i]["name"]
};
parent.postMessage(dataToSend, '*');
}
});
observer.observe({"type": "paint"});
document.getElementById('image').appendChild(img);
</script>
</body>
</html>
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