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  <title>onerror — 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}img{display:block;width:120px;height:80px;object-fit:contain;border-radius:8px;border:1px solid #e2e8f0;background:#f1f5f9;margin-bottom:.75rem}.log{padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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  <h1>dynamicImage + addEventListener</h1>

  <p>Handler registered in script — no inline <code>onerror</code> in HTML.</p>

  <img id=dynamicImage src=/images/__missing-avatar__.webp alt="User avatar">

  <div class=log id=log>Waiting for error event…</div>



  <script>var img=document.getElementById("dynamicImage"),log=document.getElementById("log");img.addEventListener("error",(function(){log.innerHTML="<strong>addEventListener error:</strong> loading fallback.",this.onerror=null,this.src="/images/codetofun-logo.png"})),img.addEventListener("load",(function(){-1!==this.src.indexOf("codetofun-logo")&&(log.innerHTML="<strong>Recovered.</strong> Fallback image displayed.")}))</script>

</body>

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HTML onerror Attribute — Dynamic addEventListener