Tryit Editor v1.7

Source Code:

Result:

<!DOCTYPE html>
<html>
<head>
<script>
function msg()
{
alert("Hello world!");
}
</script>
</head>
<body>

<form>
<input type="button" value="Click me" onclick="msg()">
</form>

<p>The button above activates a JavaScript when it is clicked.</p>

</body>
</html>

Edit the code above and click "Submit Code" to see the result.

W3Schools.com - Try it yourself

Source Code:	Result:
<!DOCTYPE html> <html> <head> <script> function msg() { alert("Hello world!"); } </script> </head> <body> <form> <input type="button" value="Click me" onclick="msg()"> </form> <p>The button above activates a JavaScript when it is clicked.</p> </body> </html>
Edit the code above and click "Submit Code" to see the result.	W3Schools.com - Try it yourself