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<style>
* {
image-rendering: pixelated;
}
</style>
<script>
window.requestIdleCallback(() => {
a.setSelectionRange(-1, 1)
document.head.innerHTML = undefined
})
</script>
<embed src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs="></embed>
<textarea id="a">aaaaaaaaaaaaaaaa</textarea>
<script>
const embed = document.querySelector("embed");
embed.onload = function() {
var countdown = 20;
if (location.search) {
countdown = parseInt(location.search.slice(1)) - 1;
}
if (countdown > 0) {
location.search = countdown;
} else {
window.parent.postMessage("done", "*");
}
}
</script>