async vs defer
Check this image for better understanding
//https://i.stack.imgur.com/wfL82.png
Async scripts are executed as soon as the script is loaded, so it doesn't guarantee the order of execution (a script you included at the end may execute before the first script file )
Defer scripts guarantees the order of execution in which they appear in the page.javascript defer
//A script that will not run until after the page has loaded
<script src="demo.js" defer></script>javascript async script
<script async src="script.js"></script>Copyright © 2021 Codeinu
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