:submit Selector——Additional Notes have a error

[pvfhv]

Additional Notes:.....For better performance in modern browsers, use [type="submit"] instead.
this is a wrong explain this selector.
:submit select type='submit' & type='default' element
[type="submit"] only select type='submit' element

[dmethvin]

I agree it's wrong as-is, but it seems the correct selector would be "input[type=submit], button[type=submit]" though. There is no "default" type.