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  <title>nomodule — external src pattern</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}pre{margin:0;padding:.75rem 1rem;background:#1e293b;color:#e2e8f0;border-radius:8px;font-size:.75rem;overflow-x:auto;max-width:480px}.result{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.8125rem;max-width:480px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>



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  <h1>External file pattern</h1>



  <p>Production sites often ship two bundles:</p>



  <pre>&lt;script type="module" src="app.mjs"&gt;&lt;/script&gt;

&lt;script nomodule defer src="app-legacy.js"&gt;&lt;/script&gt;</pre>



  <div class=result id=result>Simulating which file would load in this browser…</div>







  <script type=module>document.getElementById("result").innerHTML="This browser loads <code>app.mjs</code> (module). It ignores <code>app-legacy.js</code> because of <code>nomodule</code>."</script>







  <script nomodule>document.getElementById("result").innerHTML="This browser loads <code>app-legacy.js</code> (nomodule fallback). It cannot run ES modules."</script>



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HTML nomodule Attribute — External Script Files