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chromium/chrome/test/data/password/filled_simple_password_form.html 

<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0"/>
</head>
<body>
<form method="POST" action="done.html">
  <input type="text" id="username_field" name="username_field" value="username">
  <input type="password" id="password_field" name="password_field" value="password">
  <input type="submit" id="input_submit_button" name="input_submit_button">
</form>
</body>
</html>