document.querySelector('form').addEventListener('input', function(evt){
//faccio si che venga aggiunta classe per sottolineare input con errore
document.forms[0].classList.add('dirty');
var campi_uguali = document.forms[0].password.value === document.forms[0].ripetipassword.value;
document.forms[0].ripetipassword.setCustomValidity(campi_uguali ? '' : 'i due campi non combaciano');
}, false);
//mi posso mettere in ascolto (solo in capture perchè non fa bubbling) ull'elemento invalid e togliere il balloon pop up con errore
var error=document.querySelector('#errors');
document.querySelector('form').addEventListener('invalid', function(evt){
error.insertAdjacentHTML('beforeend',
evt.target.name + ': ' + evt.target.validationMessage + '<br/>');
evt.preventDefault();
}, true);
//così com'è ora il testo di errore stampato si somma sempre perciò devo fare così per cancellarlo
document.querySelector('input[type=submit]').addEventListener('click', function(){
error.innerHTML="";
}, false);
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