Preview:
<!DOCTYPE html>
<html>
  <head>
    <base target="_top">
  </head>
  <body>
    <h1>Example File 3</h1>
    <form action="<?= url ?>"  method="GET" >
    <input type="text"  name="username" />
    <input type="submit" name="Submit" /><br>
    <span><?= username ?></span>
    </form>
  </body>
</html>
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