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<!doctype html>
<meta charset="utf-8">
<title>Focus already focused iframe</title>
<script>
let haveGottenFocus = false;
function gotFocus() {
if (haveGottenFocus) {
parent.postMessage("FAIL", "*");
} else {
haveGottenFocus = true;
parent.postMessage("focus", "*");
}
}
window.onload = function() {
document.getElementsByTagName("input")[0].focus();
}
</script>
<input onfocus="gotFocus();">
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