Feature Request: Async/Defer for external javascript

You can add it to the head section from the settings dialog under Head Content
like this

  <script src="example1.js" defer></script>
  <script src="example2.js" async defer></script>
  <script async>
    // Inline script code
  </script>

For external scripts, using both attributes together has no practical effect, and the script will behave similarly to using async alone.

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