Try it Editor: html5_script

Edit This Code :



<!DOCTYPE html>
<html>
<body>

<p id="p1">Hello World!</p>
<script src="demo_async.js" async></script>

<p><strong>Note:</strong> The async attribute of the script tag is not supported in Internet Explorer 9 and earlier versions.</p>

</body>
</html>

Result :

html5_script_async