input type date validity test

validitytest.js

let form = document.createElement('form');
let el = document.createElement('input');
el.setAttribute('type', 'date');
el.setAttribute('name', 'okay');
form.appendChild(el);
document.body.appendChild(form);

let input = document.querySelector('form input');
input.value = 'lsk';
console.log(input.validity.valid); // says ``true``, should be ``false``
console.log(input.validity.badInput); // says ``false``, should be ``true``