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<!DOCTYPE HTML>
<meta charset=utf-8>
<body>
<script>
new PerformanceObserver(entries => {
window.parent.postMessage(entries.getEntries()[0].toJSON());
}).observe({ entryTypes: ["largest-contentful-paint"] });
const image = document.createElement("img");
image.src = "/images/green.svg";
image.id = "theImage";
document.body.appendChild(image);
</script>
</body>
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