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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
</head>
<body onLoad="doStuff()">
I should be loaded by a form submit from a sandbox with 'allow-forms'
</body>
</html>
<script>
function doStuff() {
window.parent.postMessage({ok: true, desc: "documents sandboxed with allow-forms should be able to submit forms"}, "*");
}
</script>