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  <meta charset=UTF-8>

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

  <title>oncopy — clipboardData</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 .75rem;font-size:1.25rem;color:#0f172a}.article{padding:1rem;border:1px solid #cbd5e1;border-radius:8px;background:#fff;max-width:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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  <h1>clipboardData attribution</h1>

  <p>Copy text below — pasted result includes a source line.</p>

  <div class=article id=article>

    Sample quote: Learning HTML events makes pages interactive.

  </div>

  <p class=hint>After copying, paste into a text editor to see <code>Source: codetofun.com</code> appended.</p>



  <script>document.getElementById("article").addEventListener("copy",(function(t){var e=window.getSelection().toString();t.clipboardData.setData("text/plain",e+"\n\nSource: codetofun.com"),t.preventDefault()}))</script>

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HTML oncopy Attribute — clipboardData