HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>srcdoc — dynamic update</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}iframe{border:1px solid #cbd5e1;border-radius:6px;display:block;margin-bottom:1rem;background:#fff}button{font:inherit;padding:.45rem .9rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic srcdoc</h1>

  <iframe id=dynamicIframe title="Dynamic srcdoc demo" width=320 height=100></iframe>

  <button type=button id=loadBtn>Load content</button>

  <script>document.getElementById("loadBtn").addEventListener("click",(function(){document.getElementById("dynamicIframe").srcdoc="<p style='font-family:system-ui;margin:0;padding:0.75rem;color:#065f46;'>This content is dynamically set with JavaScript.</p>"}))</script>

</body>

</html>

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HTML srcdoc Attribute — Dynamic JavaScript Update