The input element with a type attribute whose value is "submit" represents a button for submitting a form.
submit
input.submit = input.submit.attrs
input.submit.attrs = (common.attrs & name? & disabled? & form? & type & value?) & (formaction? & autofocus? & formenctype? & formmethod? & formtarget? & formnovalidate?)
The input element is a void element. An input element must have a start tag but must not have an end tag.