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  <title>Dynamic defer</title>

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  <h1>Dynamically load a deferred script</h1>

  <pre id=log>Loading script with defer…</pre>

  <script>var scriptElement=document.createElement("script");scriptElement.src="data:application/javascript,document.getElementById('log').textContent='Dynamic script with defer executed.'",scriptElement.defer=!0,document.head.appendChild(scriptElement)</script>

  <p>Set <code>scriptElement.defer = true</code> before appending when loading scripts programmatically.</p>

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HTML defer Attribute — Dynamic Script