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<!DOCTYPE html>
<head></head>
<body></body>
<script>
// Create child frame that is same-origin with its parent.
const childFrame = document.createElement('iframe')
childFrame.src = "child-frame.html"
document.body.appendChild(childFrame)
performance.mark("entry-name")
childFrame.addEventListener('load', () => {
const entries = performance.getEntries(true)
window.parent.postMessage(entries.length, "*")
})
</script>
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