learn/WebApi/Console/index.html

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    <script>
      const _log = console.log;
      const encoder = new TextEncoder();

      console.log = function (...rest) {
        window.parent.postMessage(
          {
            source: "iframe",
            message: rest.map((d) => encoder.encode(d))
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        _log.apply(console, arguments);
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    </script>

    <title>Console Object Methods</title>

    <style>
      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }
      .center {
        position: absolute;
        inset: 0;
        margin: auto;
        height: 100px;
        width: 100vh;
      }
    </style>
  </head>
  <body>
    <div class="center">
      <h1 id="warning" style="text-align: center">Buka developer console !</h1>
    </div>
    <script src="console.js"></script>
  </body>
</html>