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<!doctype html>
<a id="link-1" href="?1" onclick="window.open(this.href, 'childWin', 'height=300,width=600'); return false;">Open in window.</a>
<form target="frame" method="get">
<input type=hidden name=counter value=0>
<iframe name="frame" href="file_bug1700871.html"></iframe>
</form>
<script>
(function submitForm() {
if (location.search) {
return; // Don't fork-bomb ourselves.
}
let counter = document.querySelector("input");
counter.value = ++counter.value;
document.querySelector("form").submit();
setTimeout(submitForm, 500);
}());
</script>