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  <title>onblur — addEventListener</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}input{width:100%;max-width:320px;padding:.5rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}.log{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.8125rem;max-width:320px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>



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  <h1>element.addEventListener("blur")</h1>



  <p>Preferred modern pattern — blur fires when this field loses focus.</p>



  <input id=name placeholder="Type your name, then tab away…">



  <div class=log id=log>Waiting for blur…</div>





  <script>document.getElementById("name").addEventListener("blur",(function(){var e=this.value.trim();document.getElementById("log").innerHTML=e?"<strong>blur fired:</strong> you entered <code>"+e+"</code>":"<strong>blur fired:</strong> field was left empty."}))</script>



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HTML onblur Attribute — addEventListener