chromium/android_webview/test/shell/assets/autofill.html

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form name='formname'  action='a.html'>
  <input type='text' id='text1' name='username' placeholder='[email protected]' autocomplete='username'>
  <input type='submit'>
</form>
</body>
</html>