How to display an alert message? (Sodeso Java Wiki)

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How to display an alert message?

The following example will display an alert message:

  <html>
    <head>
      <script language="JavaScript">
        function displayAlert() {
          alert('Message!');
        }
      </script>
    </head>
    <body>
      <input type="button" onclick="displayAlert();" value="Click Me!"/>
    </body>
  </html>