<html>
<head>
<style>
/* The submit button's position and size is fixed, so that it's easy to specify
 * tap/click coordinates for it. */
#input_submit_button {
  top: 100px;
  left: 0px;
  position: absolute;
  height: 300px;
  width: 700px;
}
</style>
</head>
<body>
<!-- Use GET, so that the password is visible in the URL after submitting. -->
<form method="GET" action="done.html" id="testform">
  <input type="text" id="username_field" name="username_field">
  <input type="password" id="password_field" name="password_field">
  <input type="submit" id="input_submit_button">
</form>
<a href="done.html" id="testlink" target="_blank">Link</a>
</body>
</html>