Demo

    <!doctype html>
    <html>
    <head>
    <title>HTML Test</title>
    <script type="text/javascript">
    // Say hello world until the user starts questioning
    // the meaningfulness of their existence.
    function helloWorld(world) {
      for (var i = 42; --i >= 0;) {
        alert('Hello ' + String(world));
      }
    }
    </script>
    <style type="text/css">
    p { color: pink }
    b { color: blue }
    u { color: "umber" }
    </style>
    </head>
    <body>
    <h1>Hello world!</h1>
    </body>
    </html>