mqtt-tiles-widgets/iframededebug/index.html

<!doctype html>
<html lang="en" class="full nomp">
<head>
    <meta charset="utf-8">
    <title>iirame debug</title>
    <style>
        .nomp {
            margin: 0;
            padding: 0;
        }
        .full {
            width:100%;
            height:100%;
            box-sizing: border-box;
        }
    </style>
    <script>
        function send() {
            if (window.opener) {
                window.opener.postMessage(document.getElementById('command').value, '*')
            }
            if (window.parent) {
                window.parent.postMessage(document.getElementById('command').value, '*')
            }
            document.getElementById('result').value += "\n>>> | " + document.getElementById('command').value
        }
    </script>
</head>

<body class="full nomp">
    <input type="text" id="command" class="nomp" />
    <button onclick="send()" class="nomp">Send</button>
    <br />
    <textarea class="full nomp"  style="height: calc(100% - 50px)" id="result"></textarea>
    <script>
        document.getElementById('result').value = window.name || ''
        window.addEventListener('message', function (event) {
            if (typeof event.data === 'string') {
                document.getElementById('result').value = "<<< | " + event.data + "\n" + document.getElementById('result').value
            }
        })

    </script>
</body>
</html>