HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>scrolling — JavaScript</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{width:100%;max-width:400px;height:120px;border:1px solid #cbd5e1;border-radius:6px;background:#fff}button{margin-top:1rem;margin-right:.5rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}#out{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:560px}</style>

</head>

<body>

  <h1>Toggle iframe overflow</h1>

  <iframe id=myIframe title="Dynamic overflow demo" srcdoc="&lt;!DOCTYPE html&gt;&lt;html&gt;&lt;body style='font-family:system-ui;margin:0;padding:0.75rem;line-height:1.6;'&gt;&lt;p&gt;Tall line 1&lt;/p&gt;&lt;p&gt;Tall line 2&lt;/p&gt;&lt;p&gt;Tall line 3&lt;/p&gt;&lt;p&gt;Tall line 4&lt;/p&gt;&lt;p&gt;Tall line 5&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;"></iframe>

  <div>

    <button type=button id=btnAuto>overflow: auto</button>

    <button type=button id=btnHidden>overflow: hidden</button>

  </div>

  <p id=out>Click a button to change scrollbar behavior via CSS.</p>

  <script>var frame=document.getElementById("myIframe"),out=document.getElementById("out");document.getElementById("btnAuto").addEventListener("click",(function(){frame.style.overflow="auto",out.textContent="Set iframe.style.overflow = 'auto' (modern replacement for scrolling='auto')."})),document.getElementById("btnHidden").addEventListener("click",(function(){frame.style.overflow="hidden",out.textContent="Set iframe.style.overflow = 'hidden' (modern replacement for scrolling='no')."}))</script>

</body>

</html>

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HTML scrolling Attribute — Dynamic JavaScript