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<html>
<body>
<h3>test page</h3>
<iframe src="about:blank"></iframe>
<script>
"use strict";
window.onmessage = function(evt) {
if (evt.data === "updated-iframe-url") {
window.postMessage("frame-updated", "*");
}
};
window.onload = function() {
document.querySelector("iframe").setAttribute("src", "context_tabs_onUpdated_iframe.html");
};
</script>
</body>
</html>