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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Page with iframes</title>
<script type="application/javascript">
let promiseResolvers = {
"testFrame1": {},
"testFrame2": {},
};
let promises = [
new Promise(r => promiseResolvers.testFrame1.resolve = r),
new Promise(r => promiseResolvers.testFrame2.resolve = r),
];
function frameLoaded(frame) {
promiseResolvers[frame].resolve();
}
Promise.all(promises).then(() => window.dispatchEvent(new Event("frames-loaded")));
</script>
</head>
<body onunload="">
<div>
<iframe id="testFrame1" src="dummy_page.html" onload="frameLoaded(this.id);" ></iframe>
<iframe id="testFrame2" src="dummy_page.html" onload="frameLoaded(this.id);" ></iframe>
</div>
</body>
</html>
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