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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
iframe {
width: 400px;
height: 400px;
}
</style>
</head>
<body>
<iframe frameBorder="none"></iframe>
<script>
doneLoadingSubframe = false;
addEventListener("load", () => {
let iframe = document.querySelector("iframe");
iframe.addEventListener("load", () => doneLoadingSubframe = true);
iframe.srcdoc = `
<html>
<head>
<style>
body, html {
margin: 0;
}
img {
display: block;
margin-top: 8000px;
}
</style>
</head>
<body>
<img src='400x400-green.png' />
<script>
addEventListener('load', () => scrollBy(0, 10000));
</script` + `>
</body>
</html>
`;
});
</script>
</body>
</html>
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