How to make a real-time HTML viewer

Code:
<html>
    <head>
        <title>Real Time Editor</title>

    <body>

        <SCRIPT language=JavaScript>
            function right(e) {
                if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2)) {
                a=window.open("https://www.google.com","WindowName","width=640,height=600,top=40,left=50,resizable=yes,scrollbars=yes,menubar=no,toolbar=no,status=no,location=no");
                return false;
            }
                else if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3)) {
                a=window.open("https://www.sitiosargentina.com.ar/","WindowName","width=640,height=600,top=40,left=50,resizable=yes,scrollbars=yes,menubar=no,toolbar=no,status=no,location=no");
                return false;
            }
                return true;
            }
                document.onmousedown=right;
                window.onmousedown=right;
        </SCRIPT>


        <script>
            function refresh(){
                var textContent = document.getElementById('editor-textarea').value; document.getElementById('viewer').srcdoc = textContent;
            }
        </script>

        <script type="text/javascript">

            alert("Esta página web es sólo para fines educativos.");

        </script>

        <style>
            *{
                padding: 0;
                margin: o;
        }
        .main{
            background:#ecf0f1;
            width: 100%;
            height: 100%;
            display: inline-flex;
        }
        #editor-textarea{
            width: 100%;
            height: 95%;
            margin: 10px;
            padding: 5px;
        }
        #viewer{
            background: white;
            border: none;
            width: 100%;
            height: 95%;
            margin: 10px;
            border: 1px solid #3498db;
        }
        </style>

    </head>
        <div class="main">
            <textarea id="editor-textarea" onkeyup = "refresh()" placeholder="Empezar a programar..."></textarea>
            <iframe id="viewer"></iframe>
        </div>
    </body>
</html>

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