gecko-dev/dom/tests/mochitest/whatwg/postMessage_chrome_helper.html

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HTML

<!DOCTYPE html>
<html>
<head>
<title>postMessage chrome message receiver</title>
<script type="application/javascript">
var gPrePath = "";
function receiveMessage(evt)
{
if (evt.data.substring(0,9) == "chrome://") {
gPrePath = evt.data;
respond("path-is-set");
} else {
// Content cannot post to chrome without privileges
try {
window.parent.postMessage("SHOULD NOT GET THIS!", "*");
}
catch (ex) {
}
var msg = "post-to-content-response";
if (evt.source !== null)
msg += " wrong-source(" + evt.source + ")";
if (!evt.isTrusted)
msg += " unexpected-untrusted-event";
if (evt.type !== "message")
msg += " wrong-type(" + evt.type + ")";
if (evt.origin !== gPrePath)
msg += " wrong-origin(" + evt.origin + ")";
if (evt.data !== "post-to-content")
msg += " wrong-message(" + evt.data + ")";
respond(msg);
}
}
function respond(msg)
{
SpecialPowers.wrap(window).parent.postMessage(msg, "*");
}
window.addEventListener("message", receiveMessage, false);
</script>
</head>
<body>
<h1 id="domain">example.org</h1>
</body>
</html>