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

  <title>scrolling — CSS overflow</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}.embed-frame{width:100%;max-width:400px;height:120px;overflow:auto;border:1px solid #cbd5e1;border-radius:6px;background:#fff}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:560px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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  <h1>Modern iframe overflow</h1>

  <iframe class=embed-frame title="Demo embed with CSS overflow auto" 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;Line 1&lt;/p&gt;&lt;p&gt;Line 2&lt;/p&gt;&lt;p&gt;Line 3&lt;/p&gt;&lt;p&gt;Line 4&lt;/p&gt;&lt;p&gt;Line 5&lt;/p&gt;&lt;p&gt;Line 6&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;"></iframe>

  <p class=hint><code>overflow: auto</code> replaces <code>scrolling="auto"</code>. Use <code>overflow: hidden</code> for <code>no</code> and <code>overflow: scroll</code> for <code>yes</code>.</p>

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HTML scrolling Attribute — CSS overflow Replacement