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  <title>onerror — image fallback</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}.status{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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  <h1>Image fallback with onerror</h1>

  <p>The first <code>src</code> is broken. The handler loads a placeholder instead.</p>

  <img id=photo src=/images/__missing-product__.webp alt="Product photo" onerror=handleImageError(this)>

  <div class=status id=status>Loading image…</div>



  <script>function handleImageError(e){document.getElementById("status").textContent="error fired — swapping to fallback.",e.onerror=null,e.src="/images/codetofun-logo.png",e.alt="Placeholder image"}document.getElementById("photo").addEventListener("load",(function(){-1!==this.src.indexOf("codetofun-logo")&&(document.getElementById("status").innerHTML="<strong>Fallback loaded.</strong> User sees a placeholder, not a broken icon.")}))</script>

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HTML onerror Attribute — Image fallback handler