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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Toplevel data navigation</title>
</head>
<body>
test2: data: URI in iframe tries to window.open(data:, _blank);<br/>
<iframe id="testFrame" src=""></iframe>
<script>
let DATA_URI = `data:text/html,<body><script>
var win = window.open("data:text/html,<body>toplevel data: URI navigations should be blocked</body>", "_blank");
setTimeout(function () {
var result = win.document.body.innerHTML === "" ? "blocked" : "navigated";
parent.postMessage(result, "*");
win.close();
}, 1000);
<\/script></body>`;
window.addEventListener("message", receiveMessage);
function receiveMessage(event) {
window.removeEventListener("message", receiveMessage);
// propagate the information back to the caller
window.opener.postMessage(event.data, "*");
}
document.getElementById('testFrame').src = DATA_URI;
</script>
</body>
</html>
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