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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8"/>
<title>Test for Bug 1260931</title>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<script>
function onload() {
let iframe1 = document.getElementById("iframe1");
iframe1.contentWindow.postMessage("HI", "https://example.net");
}
window.onmessage = function(evt) {
document.getElementById("message").textContent = evt.data;
let iframe2 = document.createElement("iframe");
iframe2.src = "dummy.html";
document.body.appendChild(iframe2);
};
</script>
<body onload="onload()">
<div>
<iframe id="iframe1" src="test.html"></iframe>
<span id="message"></span>
</div>
</body>
</html>
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