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<!doctype HTML>
<head>
<meta name="responsive-embedded-sizing">
<style>
body { margin: 0; }
#box { width: 100px; height: 200px; background: blue; }
</style>
</head>
<div id="box"></div>
<script>
window.addEventListener('message', (e) => {
if (e.data === 'navigate') {
window.location.href = 'iframe-contents-slow.html';
} else if (e.data === 'unsized') {
window.location.href = 'iframe-contents-unsized.html';
}
});
</script>