if (tn == 'FORM') {
// FORM itself is passed.
formAdded = true;
- } else if (tn == 'INPUT' || tn == 'TEXTAREA' || tn == 'SELECT') {
+ } else if (tn == 'INPUT' || tn == 'TEXTAREA' || tn == 'SELECT' || tn == 'BUTTON') {
// This is a single form elemenent.
} else {
return this._error('inv_form_el', (v.name||''), v.tagName);