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<!doctype HTML>
<head>
<style>
* { margin: 0 }
</style>
<meta name="responsive-embedded-sizing">
</head>
<div id="target" style="width: 100px">
<img src="slow-image.py?name=1x1-navy.png" width="1" height="1">
</div>
<script>
document.addEventListener('DOMContentLoaded', () => {
target.style.height = '200px';
window.parent.postMessage({
type: 'DOMContentLoaded',
}, '*');
});
window.addEventListener('load', () => {
target.style.height = '400px';
window.parent.postMessage({
type: 'load',
}, '*');
});
</script>