<!doctype html>
<html lang='es'>
<head>
<title>Nuevo_Proyecto</title>
<meta charset='utf-8'/>
<meta name='viewport' content='width=device-width, initial-scale=1'/>
<style>
body{
width:96vw;
height:100vh;
overflow:hidden;
background-color:#000;
}
textarea{
width:95vw;
height:50vh;
resize:none;
}
iframe{
width:95vw;
height:50vh;
}
</style>
</head>
<body>
<textarea placeholder="Inglese su código.ت)" id="text" onkeyup="document.getElementById('if').srcdoc=document.getElementById('text').value;"></textarea>