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  <title>nomodule — module 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}#output{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}.note{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

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  <h1>Module + nomodule fallback</h1>

  <div id=output>Detecting which script runs…</div>



  <script type=module>document.getElementById("output").innerHTML="<strong>Module script ran.</strong> Your browser supports <code>type=&quot;module&quot;</code>. The <code>nomodule</code> script below was skipped."</script>



  <script nomodule>document.getElementById("output").innerHTML="<strong>nomodule script ran.</strong> Your browser does not support ES modules, so the fallback loaded instead."</script>



  <p class=note>Modern browsers show only the module message. Legacy browsers (without module support) show the nomodule message.</p>

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HTML nomodule Attribute — Module and Fallback Scripts