HTML - async attribute in html - tutorial

Code

<!DOCTYPE html>
<html>
   <head>
   <title>html tutorial - html5 - html code - html form - In 30Sec by Microsoft Award MVP - | wikitechy async attribute</title>
   <base href="../tryit/">
   </head>
   <body>
   <script src="async_demo.js"></script>
   <h2>Welcome to Wikitechy!</h2>
   </body>
</html>

Result