ilearnjavascript/plainjs - window.postmessage and iframes - 6.html Secret

## plainjs - window.postmessage and iframes - 6.html
<!DOCTYPE html>
<html lang="de">

    <head>
        <meta charset="utf-8">
        <title>iframe</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>

    <body>
        <h1>iframe</h1>
        <button>Trigger postMessage</button>

        <div id="innerContainer"></div>
    </body>

    <script>
        document.querySelector("button").addEventListener("click", function() {
            top.postMessage("message from iframe", 'http://127.0.0.1:8080');
        });
    </script>

</html>
	<!DOCTYPE html>
	<html lang="de">

	<head>
	<meta charset="utf-8">
	<title>iframe</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	</head>

	<body>
	<h1>iframe</h1>
	<button>Trigger postMessage</button>

	<div id="innerContainer"></div>
	</body>

	<script>
	document.querySelector("button").addEventListener("click", function() {
	top.postMessage("message from iframe", 'http://127.0.0.1:8080');
	});
	</script>

	</html>