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<!DOCTYPE html> <html> <body> <p id="p1">Hello World!</p> <script id="myScript" src="demo_async.js" async></script> <p>Click the button to find out if the script was executed asynchronously as soon as it was available.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myScript").async; document.getElementById("demo").innerHTML = x; } </script> </body> </html>